Bopper knees are the bruised knees of a bitch that sucks on cock for money or anything of value. Bopper knees do not discriminate. They can be on a hoe suckin dick to get on a private jet, or they can be on a skeezer suckin dick for a bag of used DVD movies.
by BigBen594 December 9, 2020

When you get stuck posing with the fat girl on your knee in a group photo. Afterwards the knee looks like a swaybacked horse.
Alpha male- "Dude, thanks for being my wingman, sorry about that grenade knee."
Beta male- "Okay, Bro, but next time you get the grenade knee."
Alpha male *under his breath* "Yeah, right."
Beta male- "Okay, Bro, but next time you get the grenade knee."
Alpha male *under his breath* "Yeah, right."
by wifeofashlong December 29, 2018

by hbarrowXx January 15, 2011

When broken ankles isn't enough
by arms weak April 4, 2021

when your friends are discussing risqué topics and it's so risqué you need to cover your virgin knees. Covering your virgin eyes and ears isn't enough. Protect your knees.
by thestubz October 12, 2019

"Jeremy, what was all that commotion last night?"
"Oh I was with my mate Michael, we were just playing Knee Rugby"
"Oh I was with my mate Michael, we were just playing Knee Rugby"
by Splosh696969 January 27, 2018

When someone (usually of the tall variety) stands up straight and their knees look like a fetus face. Also knows as 'Old Man Face Knees'.
by Mungo260 January 8, 2016
