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.

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