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.
by Secretive Jim January 13, 2005
Can you define these popular missing words?
back wheels also known as a pair of bollocks or nuts
look at the size of his "back wheels"
by john rawlings September 18, 2004