stabbed in the back 

To be betrayed by one's friends

Jim: Joe slept with my girlfriend. You could say I got stabbed in the back

stabbed in the back by The Duke of Banterburry March 10, 2016

Smash the backdoor down 

A derogatory term for forcefully penetrating a woman anus with your erect member, ferociously and with conviction, then proceed to hammer away before ejaculating.

I'm gonna smash the backdoor down of that girl when I get her home.

Smash the backdoor down by weirdalwankovich August 28, 2009

fell off the back of a truck 

A reply generally given by bentnose boys to the law-abiding consumer to convince them goods are legit. Now often used sarcastically to refer to stolen goods.

Lula Mae: This TV is very affordable. It's not stolen is it?
Vinny the Mafioso: Nah, it fell off the back of a truck

fell off the back of a truck by oz November 7, 2003

diamond in the back 

Refers to the vintage 1970-1980 Cadillac series. The rear windows had a diamond shape.

(I wanna...) Diamond in the back, sunroof top, diggin the scene with a gangsta lean

diamond in the back by James. June 24, 2004

Taking the back door 

anal

"Oh man....she got so drunk she asked me to take the back-door in..after she showered, that is..."

Taking the back door by Kevie October 13, 2003

off the bracks 

a contraction of off the chain and the bracks

aka HELLA FINE

DAMN that beezy is OFF THE BRACKS!

off the bracks by mute:X September 14, 2009

Kickin' it in the Back Seat 

To take part in sexual activities in the backseat of a car that is being driven by someone without them knowing of the activities occurring in the backseat.

I hate it when my friend and his girlfriend are kickin' it in the back seat. I wasn't expecting to see that in the rear view mirror.

Kickin' it in the Back Seat by jdawg29 August 4, 2011