PUG: Pick Up Guru
PUA: Pick Up Artist
gPUA: Green PUA. Replacement for the RAFC acronym. See RAFC for more explanation. Teaches a guy to make 'i am' rather than 'i want' statements about himself.
rAFC: Recovering Average Frustrated Chump. A guy who realizes consciously that he is an AFC and is taking the steps to correct the situation. A lot of guys have chosen to deprecate this acronym in favor of GPUA (Green PUA), which is much more positive. In that regard, a guy is only RAFC for the moment he realizes his AFCness and chooses the path to PUAdom. Once choosing that path, he becomes a GPUA. Some guys make use of a small "r" in rAFC to denote that their recovery from AFCdom is still being worked on. So, if you can follow this logic, the levels of skill, in order of precedence is: WBAFC, BAFC, AFC, rAFC, RAFC, GPUA, PUA, PUM, PUG (although PUM and PUG are rarely used). Most guys in the western hemisphere are AFC.
AFC: Average Frustrated Chump. A "nice guy". A guy who has no pick up skills and rarely manages to close a target pick up. Also a guy who tends to supplicate in his behavior to HBs. Meaning, buying flowers for a chick when going out for coffee, putting her on a pedestal, and generally letting women walk all over him in the vein hope of somehow being seen as attractive in their eyes. A common term used for AFCs that have seen the error of their ways but not yet gained PUA skills is RACF (Recovering AFC).
WBAFC: Way Below Average Frustrated Chump

