Top definition
1. the bruises on your knees from giving head.

2. the scraps and bruises on your knees from grinding in the "on top" position
girl: OW! look at my knees! they're bruised as hell.

boy: but weren't those sex knees so worth it?
by indubiately April 19, 2009
Get the mug
Get a sex knees mug for your sister Yasemin.