The act of a threesome with one dude on the bottom, a girl in the middle, and the other dude on top; double penetration when the two dudes sacks are clapping against each other.
Dude! That was an awesome round of nut knocking last night when we tag teamed that bitch!
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To rap on someone's sack, preferably a male, in a manner that causes pain.
Bubba was chillin' with his bitch, so I nut knocked him.
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To impregnate a female.
My life has been nothing but hell after I found out I nut knocked that chick from Lazlo's party.
When you nut so hard it gives you the sensation of having been knocked out.
"Oh man did you just Knock Nut yourself?"
"If I did, I wouldn't be talking to you at this very moment now would I?"
"Damn you right."