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3.
A transsexual who is attracted to members of the opposite sex. Because they are a transsexual, ('a man in a woman's body' or 'a woman in a man's body') they feel that they are homosexual, not straight. A transfag may or may not be a transvestite.

Usually a self deprecating term used to identify the person themself.
1)Margaret, (Or 'Lee' as she likes us to call her,) is a transfag, because she feels that she is a man in a woman's body, and is attracted to men as another man might be.

2) I'm a genderfuck, pansexual transfag.
by queerdel September 03, 2006
 
1.
A transsexual (Usually a transman: a man whom happens to be transexual) whom is attracted to members of the same sex. (NOT the gender they were born with, but the gender they have become/are on their way to being).

This means to a transman: he will date biomen and transmen.

This means to a transwoman: she will date biowomen and transwomen.

It is generally a term used by trans people themselves, to describe one another in jest (exactly as many homosexual youth call each other 'fag' nowadays). Transfag is a combination of 'trans' (meaning transgender or transsexual. transgender being somebody non-gendernormative, and transexual being somebody whom changes their body permanently) and 'fag' which in this case refers to homosexuals.

Also, for further reference, it is generally EXTREMELY offensive to refer to a transsexual as the gender they were born with as opposed to what they are. Especially when the offending person knows what gender they are (i.e. 'Margeret, whom wants to be Lee' and then calling him a 'she' would most often be exceedingly offensive to 'Lee'.)
Sam and Nate identify as transfags because they're fags whom happen to be transexuals.

by Arpad_ February 08, 2007
 
2.
A derrogatory term for a transexual/transvestite.
"That girl standing outside of the club in Keywest was...uh, that wasn't a girl. It was a transfag, is what it was."
by Katyaa August 10, 2006