A name you call someone either before or after they do something stupid.
Hey buttsmack, don't stick your hand in that toaster.

Hey buttsmack, I can't believe you just did that!
by ChrisPixel February 9, 2005
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This is where you have the mad runs, and you get your girlfriend to come over and play some kinky games with you. You bend over and tell her to spank you as hard as she can and when she does you spray her with shit and she'll end up using her hand like a fan, causing your shit to backfire... ENJOY!
The bendy buttsmack makes me have orgasms. -or- One time i bendy buttsmacked my dog and it was really intense.
by slamy July 24, 2004
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