Smash your back doors in 

To bang someones back passage with either a penis , cucumber or rolling pin!

Hmmm Smash your back doors in - Do we really need an example?? I have pictures if that would be more useful?

Smash your back doors in by Steffithebackdoorsmasher June 18, 2011

Smash your Back Doors In 

The act of anally penetrating someone.

As the girl walked by, Oz said "I smashed her back doors in"

Mike said to Edie "Can I Smash your Back doors in?"

Smash your Back Doors In by Flangeman100 September 11, 2009

smash your back door in 

A term used to describe the act of anal sex, popularised by Keith Lemon.

(courtesy of Keith Lemon),

'I want to smash your back door in and spunk on your tits'.

smash your back door in by sphilli2004 March 2, 2011