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1.
The expression for what you do with your buttcheeks when you need to really need to hold in your fart. Called "nutcracking" because you clench your cheeks so tightly that you could crack a walnut (or some other kind of nut) in between them.
Oh man, I'm totally nutcracking it right now!
de Twin D-hoo 1 juin 2010
 
2.
the pair of circular objects between the legs being slammed, jagged, slaughtered, bruised and mistreated by a crazy somewhat ratchet female
"That hoe nut cracking the shit out his....dayuuum"
de Kayla young 5 février 2014