Here are some commonly used abbreviations within a BDSM setting. You may comment below with any additions, I may add later.
A – Levels
AB – Adult Baby
ATM – Ass to Mouth
BBW – Big Beautiful Woman
BDSM – Bondage & Discipline (BD) Dominance & submission (Ds) Sadism & Masochism (SM)
CBB – Cock and Ball Bondage
CBT – Cock and Ball Torture
CD – Crossdresser
CFNM – Clothed Female, naked Male
CNC – Consent Non Consent
COB – C** on Body
CP – Corporal Punishment
Cake – Cunnilingus
Cuck – Cuckold
D/s – Dominant/submissive
FEMDOM – Female Domination
FT or FTT – Full Toilet or Full Toilet Training
GFE – Girlfriend Experience
GS – Golden Shower
HS – Hard Sports
IRL – In Real Life
NT – Nipple Torture
OTK – Over The Knee
PDA – Public Display of Affection
RACK – Risk Aware Consensual Kink
SPH – Small Penis Humiliation
SOT – Strap On Training
SOW – Strap On Worship
SSC – Safe Sane Consensual
TPE – Total Power Exchange
TS Girls – Trans Sexual Girls
WS – Water Sports