Undocumented assembler opcodes

This document found floating around IBM's St. Louis office

AAC: Alter All Commands
AAD: Alter All Data
AAR: Alter At Random
AB: Add Backwards
ABR: Add Beyond Range
ACQT: Advance Clock to Quitting Time
ADB: Another Damn Bug (UNIX)
AFF: Add Fudge Factor
AFHB: Align Fullword on Halfword Boundary
AGB: Add GarBage
AI: Add Improperly
AIB: Attack Innocent Bystander
AMI: Adjust Memory for Inflation
AOI: Annoy Operator Immediate
AR: Alter Reality
ARN: Add and Reset to Non-zero
AS: Add Sideways
AWP: Argue With Programmer
AWTT: Assemble With Tinker Toys
BAC: Branch to Alpha Centurai
BAF: Blow All Fuses
BAH: Branch And Hang
BAM: Branch After Midnight
BB: Branch on Bug
BBI: Branch on Burned-out Indicator
BCF: Branch and Catch Fire
BCIL: Branch Creating Infinite Loop
BCR: Backspace Card Reader
BCU: Be Cruel and Unusual
BDC: Break Down and Cry
BDM: Branch and Disconnect Memory
BDT: Burn Data Tree (follows Decorate Data Tree)
BE: Branch Eventually
Branch Everywhere
BF: Belch Fire
BLP: Boot from Line Printer
BLM: Branch, Like, Maybe
BLMWM: Branch, Like, Maybe, Wow, Man
BLSC: Branch on Lapsed Service Contract
BM: Branch to Monday
BMP: Branch and Make Popcorn
BNA: Branch to Nonexistent Address
BNO: Branch on New Operator
BNR: Branch for No Reason
BPEOR: Bypass End Of Reel
BPIM: Bury Programmer In Manuals
BPP: Branch on Programmer Present
BRA: BRanch Anywhere
BRL: BRanch and Leak
BSM: Branch and Scramble Memory
BSST: Backspace and Stretch Tape
BT(BRT): Branch on Tuesdays
BTK: Back To Kansas
BW: Branch on Whim
BWOP: BeWilder OPerator
CAAL: Compute Answer And Loop
CAB: Crash And Burn
CAG: Convert ASCII to Greek
CAIL: Crash After I Leave
CAT: Confused And Tired (UNIX)
CBA: Compare and Branch Anyway
CBNC: Close, But No Cigar
CC: Call Cavalry
CCD: Clear Core and Dump
CEE: Cause Errors Elsewhere
CF: Come From
CH: Create Havoc
CIB: Change Important Byte
CIMM: Create Imaginary Memory Map
CL: Call Lawyer
CMD: Compare Meaningless Data
CMI: Clobber Monitor Immediate
CML: Compute Meaning of Life
CNB: Cause Nervous Breakdown
COLB: Crash for Operator's Lunch Break
COS: Copy Object code to Source file
COWHU: Come Out With Hands Up
CPB: Create Program Bug
CPR: Compliment PRogrammer (like, “aren't you cute”)
CRASH: Continue Running After Stop or Halt
CRM: Clear Random Memory
CRN: Convert to Roman Numerals
CS: Crash System
CSL: Curse and Swear Loudly
CSN: Call Supervisor Names
CVFL: ConVert Floating to Logical
CVFP: ConVert Fortran to Pascal
DA: Develop Amnesia
DAP: De-select Active Peripheral
DBL: Desegregate Bus Lines
DBZ: Divide By Zero
DC: Degauss Core
DCGC: Dump Confusing Garbage to Console
DD: Destroy Disk
DDC: Dally During Calculations
DDWB: Deposit Directly in Wastepaper Basket
DEC: Decompile Executable Code
DIE: DIsable Everything (UNIX during hardware errors?)
DIRFO: Do It Right For Once
DK: Destroy Klingons
DKP: Disavow Knowledge of Programmer
DLN: Don't Look Now
DMAG: Do MAGic (the only command a programmer really needs)
DMPE: Decide to Major in Phys Ed
DPC: Decrement Program Counter
DPMI: Declare Programmer Mentally Incompetent
DSI: Do Something Interesting
DSTD: Do Something Totally Different
DSUITv: Do Something Utterly, Indescribably, Terrible
DTC: Destroy This Command
DTI: Do The Impossible
DTVFL: Decrement Third Variable From Left
DWIM: Do What I Mean
EBB: Empty Bit Bucket
EBRS: Emit Burnt Resistor Smell
ECO: Electrocute Computer Operator
ECP: Erase Card Punch
EDD: Eat Disk and Die
EDIT: Erase Data and Increment Time
EEP: Erase Entire Program
EIAO: Execute In Any Order
EIOP: Execute Invalid OPcode
ENA: Enable Anything
ENF: Emit Noxious Fumes
EOB: Execute Operator and Branch
ERM: Erase Reserved Memory
EROM: Erase Read Only Memory
ESL: Exceed Speed of Light
ESS: Enable Sprinkler System
EXX: (a real instruction on the Zilog Z-80) (Zilog is owned by Exxon)
FB: Find Bugs
FD: Forget Data
FLD: FLing Disk
FLI: Flash Lights Impressively
FM: Forget Memory
FRG: Fill with Random Garbage
FSM: Fold, Spindle, and Mutilate
GBC: Go to the Back of the Class
GCAR: Get Correct Answer Regardless
GDP: Grin Defiantly at Programmer
GIE: Generate Irreversible Error
GND: Guess the Next Digit
GORS: GO Real Slow
GPS: Give Programmer the Shaft
GREP: Global Ruin, Expiration and Purgation (UNIX)
HAH: Halt And Hang
HCRS: Hang in CRitical Section
HELP: type “no HELP available”
HF: Hide a File
HOO: Hide Operator's Output
IBR: Insert Bugs at Random
IDI: Invoke Divine Intervention
ILI: Ignore Last Instruction
IP: Increment and Pray
IPW: Invert Print Wheel
ISC: Insert Sarcastic Comment
ISP: Increment and Skip on Pi
IU: Ignore User
JAA: Jump Almost Always
JFI: Jump to Following Instruction
JFM: Jump on Full Moon
JLP: Jump and Lose Pointer
JNL: Jump when programmer Not Looking
KP: Krunch Paper
KUD: Kill User's Data
LB: Look Busy
LOSM: Log Off System Manager
LPA: Lead Programmer Astray
LSPB: Left Shift Parity Bits
MAN: Make Animal Noises (UNIX)
MAZ: Multiply Answer by Zero
MBTD: Mount Beatles on Tape Drive
MBTOL: Move Bugs To Operator's Lunch
MDB: Move and Drop Bits
MDDHAF: Make Disk Drive Hop Across Floor
MLP: Make Lousy Program
MMLG: Make Me Look Good
MNI: Misread Next Instruction
MRZ: Make Random Zap
MWT: Malfunction Without Telling
OML: Obey Murphy's Law
PBC: Print and Break Chain
PBM: Pop Bubble Memory
PEHC: Punch Extra Holes in Card
PIBM: Pretend to be an IBM
POW: Print Obscene Words
PUL: Print in Unknown Language
RA: Randomize Answers
RAU: Ridicule All Users
RBAO: Ring Bell and Annoy Operator
RBEOR: Read Beyond End Of Reel
RCB: Read Commands Backward
RCR: Rewind Card Reader
RDA: Refuse to Disclose Answer
RDCH: Read Disk and Crash Head
RDI: Reverse Disk Immediate
RENVR: REName Variables Randomly
RF: Read Fingerprints
RHP: Read Hub Protector
RLI: Rotate Left Indefinitely
RLP: Refill Light Pen
RPB: Read, Print and Blush
RTP: Reduce ThroughPut
SAI: Skip All Instructions
SAS: Sit And Spin
SDD: Seek out and Destroy Data
SDE: Solve Differential Equations
SFH: Set Flags to Half-mast
SFT: Stall For Time
SOS: Sign Off, Stupid
SPS: Smoke Power Supply
SRO: Sort with Random Ordering
SSJ: Select Stacker and Jam
STO: Strangle Tape Operator
STPR: SToP Rain
SUI: Subtract User's IQ
SUP: Solve Unsolvable Problem
SUR: Screw Up Royally
SUS: Stop Until Spring
SWT: Select Wrong Terminal
TARC: Take Arithmetic Review Course
TBGTG: Two BurGers and fries To Go
TC: Transmit Colors
TCAR: Transmit Colors, but Avoid Red
TLO: Turn indicator Lights Off
TLW: Transfer and Lose Way
TN: Take a Nap
TPDH: Tell Programmer to Do it Him/Her self
TRA: Te Rdls Arvs (Type Ridiculous Abbreviation)
TT%EKB: TeleType - Electrify Keyboard
TTA: Try, Try Again
TTL: Tap Trunk Line
UAI: Use Alternate Instruction set
UCB: Uncouple Comm lines and Break
UEP: Update and Erase Program
UP: Understand Program
VAX: Violate All eXecutions
VFO: Violate Female Operator
VMA: Violate Maintenance Agreement
VNO: Violate Noise Ordinance
VVM: Vaporize Virtual Memory
VW: Void Warranty
WAD: Walk Away in Disgust
WBF: Write Bad File
WDI: Write Data and Ignore
WHP: Wave Hands over Problem
WQWH: Write Quietly With Hangover
WSWW: Work in Strange and Wondrous Ways
XKF: eXecute Kermit the Frog
XMB: eXclusive MayBe
XOS: eXchange Operator's Sex
YKWIM: You Know What I Mean

And some miscellaneous non-instructions

IBM: It's Better Manually
I've Been Moved
Intimidated, Buffaloed Management
Insultingly Boring Merchandisers
Itty Bitty Machine
Ingrained Batch Mentality
Intelligence Belittling Mammoth
I Bought Macintosh
Incest Begets Madness
Intellectuals Being Moronized
Inspect Before Multiusing
Inertia Breeds Mediocrity
It Beats Mattel
Insipid Belligerent Mossbacks
Imperialism By Marketing
Institution By Machiavelli
Into Building Money
Irresponsibly Behaved Multinational
Impentrable Brain Matter
Itsa Big Mess
Ingenuity Becoming Mysterious
Intolerant of Beards and Mustaches
Install Bigger Memory
RAM: Rarely Available Memory
SPA: Sliding Point Arithmetic
VPA: Vanishing Point Arithmetic
WOM: Write Only Memory