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3. bum fun
A term describing anal sex with gay men.
Well, if being a rent boy is gonna get you bum fun, Daffyd, then I'm all for it.
1. bum fun
Bum=homeless person - Fun=fun

1 Bum Fun is when you go out and torment the homeless for your own amusement

2bum fun is intended for people to see how good there life really is by making fun of the homeless.
I went out and had some bum fun today.

it made me realize that my life is much better than i thought.
2. Bum fun
Anal sex, usually referred as between two males.
"lets have some bum fun!" Terry shouted to his Father
4. Bum Fun
anal intercourse specifically and also in a broader sense appreciation of the buttocks
I love bum fun both ways
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