a gay man who only falls for straight guys, and will spend a lot of emotional energy on them and think that they are in a kind of relationship-be it a buddy-buddy, mentor-protege, whatever, that is mutually beneficial. All the while the straight man loves the attention and the affection, and the gay man avoids any real possibility of intimacy.

female equivalent: fag hag

When you eat dirt for the first time and leave your family to build a shack in the woods

The gay male confidant of the fagstag.
The male version of a hagfag.
A straight male with a gay confidant.

A stag fag is a slang term for a woman who either associates mostly or exclusively with heterosexual men, or is best or good friends with a straight man or men. It is a derivative of fag hag and stag hag.

Most of the time, stag fags are homophobes and are usually uncomfortable around other gay men. Like it's phrase-predecessors, it is widely acknowledged that a rich relationship can develop between a straight man and a gay man without sexual tension. The stag fag relationship allows the participants to separate intimacy and sexuality.