double backer 

when some one moons you and pushes their sack back near their ass it's called a double backer

hey derek when you double backerd me you had poo chunks on your nuts

double backer by Caflisch22 May 4, 2006

double backed monster 

An insulting term for sexual intercourse. Used by Shakespear in Othello.

Roomate: Oh crap dude! We need some kind of signal like a sock on the doorknob or something. I cant believe I walked in on you and your girl making the double backed monster.

double backed monster by scott trowbridge June 11, 2006

Double backed beast 

A euphemism for coitus. This form is more common in popular culture than the original two backed beast. Predates Shakespeare.

Double backed beast... "These two did oftentimes do the two-backed beast together, joyfully rubbing and frotting their bacon 'gainst one another, in so far, that at last she became great with child of a fair son, and went with him unto the eleventh month; for so long, yea longer, may a woman carry her great belly, especially when it is some masterpiece of nature, and a person predestinated to the performance, in his due time, of great exploits."
François Rabelais (c. 1494 - 1553)
"Gargantua and Pantagruel"

Double backed beast by banquo_lives January 11, 2009

Double Backed Snake 

Double penetration involving a snake. Pleasure is derived from the snake's flickering tongue and rattle.

"Yo, I heard she did a double backed snake. Son."

Double Backed Snake by PandaFace April 1, 2007

double backed monster 

the look and sound of two people having sex that leads others to assume there is a double backed monster in the bed.

i walking in and it looked like there was a double backed monster on her bed.

double backed monster by bnt07 November 22, 2011

double backed walrus 

A sex move that involves laying on your back next to your partner while being engaged in the act of (cross-)masturbation

Me and Jane were way to tired to have sex yesterday so we just did a double backed walrus before going to sleep

double backed walrus by Bertyl December 28, 2015

double backed 

a broad that has absolutely no breasts, and could be mistaken for a boy if fondled in the dark.

"dude, that bitch is so double backed i can't tell which side is the front!"

double backed by chadsicle January 22, 2005