back down

When you put them in thier place.

When you make a 3 pointer and they are on you real tight, or when you beat someone's ass really hard.

by Kirtus Pittman December 13, 2004

Back Knee

When a person is so fat that the back of their knees look like the fronts of their knees

Dude did you see her back knee?
Yeah man, that shit was gross.

by SeizurgasmDude March 29, 2012

Blown Back

To get destroyed, wrecked, or to lose badly in a game and or life.

"Did you hear about when Andrew was talking about Skye?"

"Yeah, he talked all that good but then he got blown back."

by Godly God God September 21, 2014

back wheels

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

T-back

Better than a thong, less floss, more like a G string/Thong combo. starts wide on the top, goes to string as soon as it hits the top of the ass crack.

Check that bitch's T BACK! DAAYUM!!

by Big Fat White Guy November 12, 2003

back engineering

A True Geologists term for bum sex

That was great back engineering JP!

by elmert johnstone March 19, 2007

mattress back

1. (noun) A girl who has sex so often, whether with the same partner (nympho), or many different ones(slut), that her back seems to be constantly on a mattress.
2. a condition derived by a girl who engages in said activities.

1. "That girl is a mattress back if I ever saw one."
2. "You're gonna get mattress back if you keep sleeping around like that."

by Pleasure Boy 1, erotic fiction author December 11, 2004