1: Used to describe someone that regularly smokes cigarettes. The word"fag" can refer to a ciggarete, and the word bum can refer to the act of smoking a cigarette. So if you bum a fag then you smoke a cigarette.

2: Used to describe a homosexual man that regularly has sex. The word fag can refer to a homosexual person, and if you bum someone it means to have anal sex with them. So if you bum a fag then you have anal sex with a gay man. Bumming fags is very enjoyable to a Bumfag.
Alex: Oi look cunt, Aunt Betty is bumming a fag.
Ollie: Yeah she's a bit of a fucken bumfag
<or>
Alex: Did you hear that Uncle Mark left Aunt Betty?
Ollie: Was it because he got caught bumming a fag
Alex: Probably, he has always seemed fucken gay
Ollie: yeah he's a fucken bumfag
by _HA_ November 24, 2017
Get the Bumfag mug.