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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.
Buttack by Toiletstains March 30, 2015
Related Words
The act of masturbating while hanging upside down, as a bat would hang from the ceiling.
Did you see the man in the trenchcoat, doing the batjack from a lamp post?

He was batjacking on the chin-up bar.
batjack by BatmanJackin' November 27, 2007

Blattack 

The art of verbally or mentally attacking a person by means of excessive use of Ebonics, black culture, or with overwhelmingly loud hip hop music.
Jeremy, you're under Blattack!
Blattack by SweenMachine May 25, 2011
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
buttack by OHHHH NOZZZZ August 21, 2013
Oh god, look at Neil and his one leg. He’s such a battock
Battock by WigglyLamppost February 18, 2024

Neil & The Battocks 

I loved watching Neil & The Battocks