On request from Stevie Leifheit, here's a basic synopsis of acronyms that are often used in the General Fitness boards.
1RM=One Rep Max, the maximum amount that can be lifted for one repetition. This may also show up as "5RM" which is where a certain amount can be lifted for only 5 repetition.
SS=Starting Strength. A strength training program and a book of the same name, created by Mark Rippetoe of Witchita Falls Athletic Club.
SL5x5=StrongLifts 5x5. A similar program to Starting Strength by Medhi from StrongLifts.com. The main difference is the use of the Pendlay Row instead of the Power Clean.
TM=Texas Method. Another Rippetoe strength training program focused towards Intermediate level lifters.
WS4SB=Westside for Skinny Bastards, a strength training program from Joe Defranco that uses conjugate programming geared more towards athletes than powerlifters.
DE=Dynamic Effort. Lifting a light weight with the focus on speed.
ME=Maximal Effort. Lifting as much as possible.
HIIT=High Intensity Interval Training. Generally used for circuit training that focuses on short intervals of intense activity with timed rest periods between intervals.
LSD=Long Slow Distance. Think "jogging."
WOD=Workout of the Day. Crossfit-styled programming where a specific workout is specified from day to day.
GHR=Glute Ham Raise
OAC=One Armed Chin-up.
OHPU or OAPU=One handed/armed push-up.
OHPress=Over head press (strict, without bouncing.)
C&J=Clean and Jerk, an Olympic lift.
C&P=Clean and Press
CGBP=Close Grip Bench Press a standard bench press performed with a very narrow grip.
HSPU - Handstand Pushup (full range of motion, usually on paralettes, parallel bars, or rings.
HePU - Headstand Pushup (not full range of motion HSPU, until your head touches the ground)
ROM - range of motion, the distance you move a weight during an exercise.
GTG - Grease the Groove, the process of using sub-maximal sets often at scattered times throughout the day.
I may have missed some (or quite a few.) Feel free to add to this list, and I'll move them into this primary post.