Bun

What is Bun?

Bun definition and meaning on Dictionary terms:
noun

any of a wide variety of variously shaped bread rolls, usually leavened and slightly sweetened or plain, sometimes containing spices, dried currants, etc.
hair gathered into a round coil or knot at the nape of the neck or on top of the head in certain coiffures.
buns, Slang. the buttocks.