A saying a person does when another person says an unfunny joke but you're being sarcastic about it, indicating it was the funniest joke you have ever heard in your life. (being sarcastic if you didn't get that)
"Hey Billy, why did the chicken cross the road?... TO GET TO THE OTHER SIDE!" *laughs hysterically*
"What a knee slapper, Timmy!" *slaps knee*
"What a knee slapper, Timmy!" *slaps knee*
by lovelyleftorgan777 May 4, 2022

by pcvbg26 August 29, 2011

A term that is used as an excuse for when you’re caught jerking one out. Could also mean jerking off in general.
Guy 1: Hey man we’re you just wanking it?!?!
Guy 2: Nah, just scratching my knee.
Guy 1: Oh, alright, continue scratching your knee then.
Guy 2: Nah, just scratching my knee.
Guy 1: Oh, alright, continue scratching your knee then.
by TheRussianHammer May 16, 2018

if a person can balance a video game controller on their knee for over 2 seconds they deserve sex from a person of their choice
person one: “hey bro! i finally got the controller knee balance”
person two: “you know what that means, time for you to fuck jessica”
person two: “you know what that means, time for you to fuck jessica”
by pepe123englishpenis January 4, 2022

man my b-knees are killing me.
by Yamatohead December 12, 2023

by har-issa December 23, 2020
