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A wank using no outside sources for arousal material, only the fantasies provided by one's imagination.
ERIC: I'm gonna go beat off.
TOBY: You want this porn mag?
ERIC: Nah, I fancy an imagiwank over that cute girl who works at the video place.
TOBY: Ah. Godspeed.
by Simon199 May 11, 2008
To masterbate to mental images as apposed to actual pornography.
Guy 1: Dude, I found some awesome porn last night! You should check it out!

Guy 2: Ah damn, my internet's down so I'm rockin' the imagi-wank at the minute...
by FunkStuff November 30, 2007