Since we didn't want to feel left out, CrossFitters developed their own acronyms. Here's the short list:
AMRAP: As Many Reps (sometimes Rounds)as Possible
BP: Bench press
BS: Back squat
BW (or BWT): Body weight
CFT:CrossFit Total - consisting of max squat, press, and deadlift.
CFSB: CrossFit Strength Bias. A program developed by Jeff Martin and Darrell White, explained here. You'll need a CFJ subscription.
C&J: Clean and jerk
C2: Concept II rowing machine
FS: Front squat
GHR(D): Glute ham raise (developer). Posterior chain exercise, like a back extension. Also, the device that allows for the proper performance of a GHR.
GHR(D) Situp: Situp done on the GHR(D) bench.
GPP: General physical preparedness, aka "fitness."
GTG: Grease the Groove, a protocol of doing many sub-maximal sets of an exercise throughtout the day
HSPU: Hand stand push up. Kick up into a handstand (use wall for balance, if needed) bend arms until nose touches floor and push back up.
HSQ: Hang squat (clean or snatch). Start with bar "at the hang," about knee height. Initiate pull. As the bar rises drop into a full squat and catch the bar in the racked position. From there, rise to a standing position
IF: Intermittent Fasting
MEBBMaximum Effort Black box, term coined by Mike Rutherford. Search the forum for it. Originally laid out in one of the early Performance Menu issues.
KTE: Knees to elbows. Similar to TTBs described below.
MetCon: Metabolic Conditioning workout
MP: Military press
MU: Muscle ups. Hanging from rings you do a combination pull-up and dip so you end in an upright support.
OHS: Overhead squat. Full-depth squat performed while arms are locked out in a wide grip press position above (and usually behind) the head.
PC: Power clean
Pd: Pood, weight measure for kettlebells
PR: Personal record
PP: Push press
PSN: Power snatch
PU: Pull-ups, possibly push ups depending on the context
Rep: Repetition. One performance of an exercise.
Rx'd; as Rx'd: As prescribed; as written. WOD done without any adjustments.
RM: Repetition maximum. Your 1RM is your max lift for one rep. Your 10 RM is the most you can lift 10 times.
SDHP: Sumo deadlift high pull (see exercise section)
Set: A number of repetitions. e.g., 3 sets of 10 reps, often seen as 3x10, means do 10 reps, rest, repeat, rest, repeat.
SPP: Specific physical preparednesss, aka skill training.
SS: Starting Strength; Mark Rippetoe's great book on strength training basics. Available right here.
Subbed: Substituted. The CORRECT use of "subbed," as in "substituted," is, "I subbed an exercise I can do for one I can't," For example,if you can't do HSPU, you subbed regular pushups. Sadly, many illiterate posters get this bass-ackward, and claim that since they can't do HSPU, they subbed HSPU for pushups. D'oh!
TGU: Turkish get-up (See exercise section)
TTB: Toes to bar. Hang from bar. Bending only at waist raise your toes to touch the bar, slowly lower them and repeat.
WO, sometimes W/O: Workout
WOD: Workout of the day
YBF: You'll Be Fine (liberally applied in spray form)