knee bangers 

When a lady gets so old that her breasts sag all the way down to her knees, they then stop being breasts as such and become "knee bangers". Another tell tale sign is when you shout, "Show us your tits!", they must lift their skirt in order to do so.

(Can also be spelt as one word - "kneebangers")

"Those knee bangers make her look like she has four arms!"
"Yeah you're happy know because they're big and firm, just wait until your older... when she turns sharply, you'll get some knee bangers to the face..."

knee bangers by Gr8 January 17, 2008

Triumphant Knee Banger 

A triumphant knee banger is when you push a girl's head towards your nether regions in hopes of getting a blowie, but you accidentally slam her head against your knee. She then vomits and grosses you out, the toxic waste falls on your crotch, staining your pants with vomit. After a while you realise that it doesn't feel so bad and cum. Hence the name.

Leila: My boyfriend did the triumphant knee banger on me.
Beethoven: Nice.

Triumphant Knee Banger by thighmaster69 October 28, 2018

knee banger 

A descriptive noun used to explain the length of mans very large penis.

You see that sully in the shower with the knee banger. Motha Fucka is hung like a walrus.

knee banger by Cornelius of Gump October 23, 2012

knee banger 

A situation or circumstance causing one's knees to shake nervously and/or uncontrollably.

"Wow! That confrontation with your boss must have been a real knee banger!"

knee banger by Susan Beamer October 2, 2007