This is a place to post up commonly used accronyms in the w-body world. Please feel free to add to this list with your own additions. Soon, we should have a permalink that gets updated. Here are a few to get started:

ABDC - After Bottom Dead Center
A/C - Air Conditioning
ACC - A/C Clutch
A/F - Air/Fuel
AFC - Air Fuel Controller
AFR - Air/Fuel Ratio
AE - Acceleration Enrichment
ALT - Alternator
AP - Air Pump
ATDC - After top dead center
BBDC - Before Bottom Dead Center
BCM - Body Control Module
BDC - Bottom Dead Center
BTDC - Before top dead center
BTSI - Brake Transmission Shift Interlock
CAI- Cold Air Intake
Cat - Catalytic converter
CKP - Crankshaft Position Sensor
CPS - Cycles Per Second (Cycles per second are taken of the crankshaft position sensor)
DEG - Degrees Celsius or Fahrenheit
DIC - Driver Information Center
DTC - Diagnostic Trouble Codes
DP - Down Pipe
ECT - Engine Cooling Temperature
EFI - Electronic Fuel Injection
EGR - Exhaust Gas Recirculator
EGT - Exhaust Gas Temperature
EST - Electronic Spark Timing
FI - Fuel Injection
FPR - Fuel Pressure Regulator
FT - Foot
FTL - For the Loser
FTMFW - For the Mother F**kin Winner
FTW - For the Winner
FWI - Fenderwell Intake
GPF - Grand Prix Forums
HAI- Hot Air Intake
HZ - Hertz (Frequency)
IAC - Idle Air Control
IAT - Idle Air Temperature
IC - Intercool(er/ed)
ISS - Idle Speed Stepper
KOEO - Key On Engine Off
KOER - Key On Engine Running
KPA - Kilopascal
KR - Knock Retard
L36 - Series II naturally aspirated 3.8L engine code
L26 - Series III naturally aspirated 3.8L engine code
L67 - Series II Supercharged 3.8L engine code
L32 - Series III Supercharged 3.8L engine code
LS4 - v8 engine code
LBS - Pounds
LIM - Lower Intake Manifold
MAF - Mass Air Flow
MAP - Manifold Absolute Pressure
MAT - Manifold Air Temp
Mg - Milligram
MPFI - Multi-port Fuel Injection
MPH - Miles Per Hour
MPS - Modular Pulley System
Ms - Milliseconds
NA - Naturally Aspirated
NBO2 - Narrowband O2 Sensor
02 - Oxygen
PCM - Powertrain Control Module
PCV - Positive Crankcase Ventilation
PE - Power Enrichment
PEM - Ported Exhaust Manifold
PLOG - Power Log; front exhaust manifold from ZZP
PSI - Pounds Per Square Inch
ROFL - Rolling on the Floor Laughing
ROTFLMAO - Roll on The Floor Laughing My Ass Off
RPM - Revolutions Per Minute
SC - Supercharg(er/ed)
SEC - Seconds
STB - Strut Tower Brace
TB - Throttle Body
TBI - Throttle Body Injection
TCC - Torque Converter Control/ Torque Converter Clutch
TCS - Torque Control System / Traction Control system
TDC - Top dead center
TOGS - The Other Guys headers
TPS - Throttle Position Sensor
T-stat - Thermostat
UIM - Upper Intake Manifold
VE - Volumetric Efficency
VS, GT, XP, XPZ - aftermarket cams
VSS - Vehicle Speed Sensor
WBO2 - Wideband O2 Sensor
WOT - Wide Open Throttle

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TOGS - The Other Guys headers
Cat - Catalytic converter
FPR - Fuel Pressure Regulator
DIC - Driver Information Center
DP - Down Pipe
STB - Strut Tower Brace

All I can think of for now.

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Master Certified Auto Glass Technician
Kansas City Pontiac Motorsports Club
Green Bastard Products
My F-Quick Garage
My GPF Garage

IC - Intercool(er/ed)
SC - Supercharg(er/ed)

Don't really know if those will help out too many people, but they are very commonly used.

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Steven Oliver
2004 GTP comp-g WS6. Gator and suede all around interior.
Advanced MECP certified installer, custom upholsterer.

GTP = awesome
GT = Slow

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Signatures suck!

flynn knows!!!

These aren't W-body specific, but very commonly used by us forum members

FTW = For the Winner
FTL = For the Loser
FTMFW = For the Mother F**kin Winner
ROFL = Rolling on the Floor Laughing

ROTFLMAO--Roll on The Floor Laughing My Ass Off

LIM lower intake manifold.

UIM upper intake manifold

NBO2-narrowband o2 sensor

WBO2- wideband o2 sensor

VE volumetric efficency


we have a nice list started!

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XP|I/C'd GEN V|ZZP TRANS|

11's or BUST

ttt- to the top (a way of sending your post/thread to the top of a page so's it will get more attention)
IIRC- If I Recall Correctly
IMO-In My Opinion
IMHO-In My Honest Opinion
SS IC-Short Stack Intercooler (ZZP product)
ODB II- A scantool used to diagnose and identify DTC's
SES-Service Engine Soon
FWD-Front Wheel Drive
WHP-Wheel Horse Power (you usually hear of "rear wheel horsepower" but since our cars are front wheel drive....)
SFI- Sequentially Fuel Injected
3100=3.1L=L82 (different terminology all referring to the same engine)
RT DP- RandomTech Downpipe
"Res"- Resonator
HUD-Heads Up Display
P & P-Port and Polish (more affordable alternative to headers when referring to exhaust mani's)
OHV-Overhead Valve (engine has a single cam to control opening and closing of exhaust and intake valves in both heads)
DHP- Digital Horsepower? tuner
DOHC- Dual Overhead Cam (engine has 2 cams, one to control set of valves
in each head)
VTEC- a dirty ricer word that should never be found in a W Body forum
ZZP- ZZ Performance ( a company specializing in performance products for FWD 3800 powered GM vehicles)
MMS-Milzy Motorsports (a company specializing mostly in FWD 3100 powered GM vehicles)
ECM-Electronics Control Module
"Comp G"-Competition Group package offered on Grand Prixs
SS- usually means "Super Sport" but in our forum, for all intents and purposes, usually means "stainless steel" ex.) SS headers
LOF- Lube, Oil, and Filter
SLP-Street Legal Performance
TGP-Turbocharged Grand Prix (Pre-97 GPs?)
GTP-Supercharged Grand Prix
GTX- pretty much the unicorn of Grand Prixs. I like to call them "Eleanor". (a Grand Prix with all kinds of SLP goodies that you could order as a FACTORY option)
GXP-basically the "GTP" option for newer Pontiacs, did away with "GTP" when GP production ceased
WP-Water Pump
UDP-Under Drive Pulley?
GMPP-GM Performance Parts
ET-estimated time

The TGP is a '89 and '90 3.1L turbo GP
And not all GTP's are supercharged Pre '97's aren't they have a 3.4L NA

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'95 GP SE (Slow Edition) coupe