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To stick ones finger ,usually in the form of a sneak attack, in someone's ass crack when it is exposed above their pant/underwear line. While doing so scream "Buttack!!!"
As Emmett leaned over exposing his plumbers crack Jason exclaimed "Buttack!!" While sliding his pointer down his toosh.
by Toiletstains March 30, 2015
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1. Anal sex went wrong
2. To enter penis into a butt with hostile intentions

3. To fuck up ones ass
I slammed my cock in her tight ass, it was too tight she got buttacked

Why are you walking weird? Did you get buttacked?

Buttacks happen more often in prison
by OHHHH NOZZZZ August 20, 2013
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