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to jack someones lumber or to be jackin' lumber lumber is basically to give someone a hand job.
Guy:"wanna come over tonight and jack my lumber?"
Girl:"eww, thats disgusting I'm never even going to touch you perv!"
Guy:"oh come on, its not like you've never been jackin' lumber before"
Girl:"Fuck You!"
by MattThePhrat August 28, 2007

Words related to jackin' lumber

girl hand job lumber lumber jack sex