"bare back blow job"  in other words, felatio without using a condom.

There is also BBBJCIM where the provider will allow you to come in her mouth and:

BBBJCIMNQNS, the NQNS part stands for "no quit, no spit" or in other words, she will swallow your semen, and it is a wonderful thing to behold.

Greek means anal sex, hopefully using a condom unless you both have a death wish.

You will find all these and many, many more acronyms and jargon but clicking on the "TER Instruction Manual"  above, in red letters just about where is says "ten top posters".

You will also find a wealth of information and just about anything you need to know about the hobby and won't have to ask here each time you run across a new term you haven't heard of before.