To knock sacks is to slam you and a bros nutsacks together while you are doing double penetration on a girl.
by Willy the Huge October 05, 2017
bro i just beat you in knock-off fortnite.Bro you're hacking.no I'm not.Brooooooo you're such a knock-off fortnite hacker
by Kadwad September 07, 2023
Having sex and then impregnating.
by x_squishygirlx December 12, 2019
by Cat 🐱🐱🐈 December 14, 2017
by Immortalgodofgaming February 22, 2022