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
Get the Backjack mug.she said she was gonna show me something ive never seen before so she pulled my pp through my legs and gave me a backjack
by peepsey April 8, 2008
Get the backjack mug.Performing the ol' reach around on yourself, an advanced masturbation technique. Word origins can be traced to dudefuckinghellyeah (DFHY) at burning man 2009.
The stranger is getting old, I think today I'll change things up and pull a dactyl backjack when I'm wanking.
by 1009 September 19, 2009
Get the Dactyl Backjack mug.During Sexual Intercourse, A woman sticks her one of her tits into the mans asshole, and reaches around and jacks you off at the same time.
by Dillon Coolman December 11, 2011
Get the Canadian Backjack mug.When a woman sticks one of her tits in the mans ass hole and reaches around and jacks you off from behind.
by D-speed December 12, 2011
Get the Canadian Backjack mug.