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Quite simply, someone's ass or buttocks in lieu of pain or a spanking on their rear end. Generally the party in question is too old for such treatment so it is comical and embarrassing.

The punishment is also generally done by more than one person who are in agreement of the action to follow.
From Open Season,

"Try that again and you'll get knocked off your funny blown bahookus !"
by dw817 November 12, 2009
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