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1 definition by real j'can

 
1.
A word derived from Jamaican slang and dancehall music -refer to macka diamond and blacka song "bun him"

It means if your boyfriend or girlfriend has cheated on you, you should do the same.
If bf/gf has given you "bun" or you are interested in giving gf/bf "bun" it simply means to cheat on them.

*the right definition*
Girl: Mi caan believe mi man gimme bun wid dat dutty gyal Sandra

Girl 2: My girl nuh cry bout dat but nuh "bun him" bac jus gi him di bakery and dun

- simply meaning don't just cheat on him might as well get pregnant while your at it =D
by real j'can January 26, 2010