Top definition
Masturbating over girls pictures on instagram, mostly over celebrities
Joe: Hey John, i had such a good instawank yesterday

John: Oh yeah me too, I was beating my meat so hard over that emily girls pictures
by MrDinosawrus May 24, 2013
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2
when you wank over someones insta account because the wifi blocks porn
James: i just did an instawank over Chelsea's fat arse
by SouLessGingER666 July 29, 2016
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