The act of laying on your back watching netflix while jacking off AKA Backjacking
Cody enjoys backjacking to american dad on netflix.
by Steelson Jeffflex October 22, 2013
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The act of multiple men sodomising eachother in a human train. Just before ejaculating each one pulls out and blows their load all over the back of the guy in front shouting "twenty-one !"
Damien the sick fuck went out and played backjack with 5 guys he met at a gay bar.
by DamienN July 14, 2006
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Verb

1. The act of rubbing ones self to ejaculation within the rolls of their partners back fat. Similar to a reverse titty fuck.
"I brought some fat broad home from the bar last night. I couldn't find her vagina, so we started backjacking instead."
by billebllunt December 9, 2013
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The act of traveling across country, sperm bank to sperm bank, funding your travels with your ejaculate
My friend and I went backjacking across North America on summer break
by Nero1313 October 2, 2015
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Verb.

the act of paying someone back in cigarettes for a cigarette bummed earlier.
catherine: hey john, can i bum a cigarette?

john: sure, as long as you backjack me
by BOBBLE BOO October 19, 2007
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A form of masturbation where you slide your hand down your dick with your hand backwards, forefinger and thumb touching eachother. Your thumb should be facing in twards your balls and your pinky out twards the head.
Painting a face on your hand is optional.
"Sometimes I rub one out backjack style to shake things up a bit."
by Clam Choder April 25, 2007
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The act of jacking off your boyfriend whist he is sat behind you as you are typing this onto his laptop at the same time. During this he is sitting on his Nintendo DS playing Pokemon.
Example: having a laptop on your knee; sitting on the end of the bed; penis in hand! There you have, a backjack!
by Carrots. June 29, 2014
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