A double knee slapper is when you hear something that is so funny that it brings out your embarrassing loud obnoxious laugh. So instead you fake laugh out loud and jump in the air, slapping both your knees going “Boop boop” then land on your feet, yelling “Thats a Double Knee Slapper!”
by DomTheItalian November 26, 2017

My double-first great-cousin-aunt is a good person.
by Hgcloziw November 23, 2019

by joshkiklaku February 18, 2022

by baddest rucca December 3, 2019

by Sean Ss November 23, 2019

by Gibby Donate January 4, 2024

The act of fisting someone with both fists through the vagina and asshole and giving yourself a fistbump during the process.
John: Hey Georgia, later you and me going to do a little double fistception later?
Georgia: I can't, I had Taco Bell earlier. Maybe some other time when I don't have the runs.
Georgia: I can't, I had Taco Bell earlier. Maybe some other time when I don't have the runs.
by Allybama July 28, 2017
