To impregnate a female.
My life has been nothing but hell after I found out I nut knocked that chick from Lazlo's party.
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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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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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."