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Basically, another way of saying something is ass, or bad, or terrible. Can be used on yourself or others.
Person 1: I feel like ass today.
Person 2: Nah you feel like Boo Boo Stank!

Player 1: oh my GOD you are BOO BOO STANK at this game!
Player 2: Kay.
by obama4eva February 08, 2011
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