Back wheel 

The view of a girls vagina area from behind.

Stacey bent over and showed her back wheel

Back wheel by Robbo3512 March 8, 2018

On the back wheel 

Riding a "bike" in hashbourne

"Aisling kenny on the back wheel say mup "
"MUP vroom vroom"

On the back wheel by Asho69xoxo December 20, 2017

hairy back wheels 

Either one of the two oval organs that produce sperm in men and other mammal males enclosed in the scrotum behimd the penis

That guy has a big set of hairy back wheels

hairy back wheels by Spanno October 6, 2015

back wheels 

Derived from the shape of a tricycle, the back wheels are the testicles to the front wheel's penis

Whilst shagging a massive monster of a woman, I slipped the back wheels in.

back wheels by Secretive Jim January 13, 2005

back wheels 

back wheels also known as a pair of bollocks or nuts

look at the size of his "back wheels"

back wheels by john rawlings September 18, 2004

Getting the back wheels up

To stick your dick and balls into a pussy at the same time

Ive been getting the back wheels up a fair bit lately on my new cum rag

Getting the back wheels up by fista May 2, 2015

Road rash on my back wheels 

This means to stick your dick and balls into a gay dudes asshole and take it out with poop on it

I got road rash on my back wheels

Road rash on my back wheels by Road rasher August 13, 2023