Top Definition
A nasty smell that lurks in the air that has high notes of ass that has not been washed in a week. The word originates from the Iranian word for ass - 'kun'.
Girl: Damn that smells bad, what the hell is it?

Boy: I've got a cold, what does it smell like?

Girl: Birakunisineh
by skeendotcom January 24, 2010

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