BB means bareback, e.g. BBBJ is for blowjob without condom. BB on its own refers to sex without a condom. No idea what JT is I've never seen that.

CIM means cum in mouth

NQNS means no quit no spit, which means blowjob to swallow.

DATY means dining at the Y, that is the escort allows you to go down on her.

DFK means deep french kissing.

DATO means dining at the orifice, that is the escort allows you to rim her anus.

CG means cowgirl, a type of sex position.

K9 is doggy style, another sexual position.

Mish is missionary, yet another sexual position.

Swallow is obvious, isn't it?

MSOG means multiple shots on goal. Meaning the escort will allow you to have sex with her multiple times during your time.

LFK means light french kissing.

FIA means finger in ass.

Not sure what miss is.