knock boots 

hetero vaginal sex. The sound made sounds like knocking boots, unless one of the partners is fat

i knocked boots with your mum

knock boots by Kung-fu Jesus July 29, 2004

knock'n boots

having sex; as in having such great sex, her legs will be shakey causing her boots to knock together

She's so hot; me and her will be knock'n boots tonight

knock'n boots by mia swallows July 24, 2006

knock her boots

When you want to have sex with a girl very badly.

Yo Jeff
Yea Craig
You know Maria, right?
Yea, why?
I wanna knock her boots man

knock her boots by The_One1 March 11, 2017