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1.
The hand you don't use while masturbating. 'Catch hand' applies when in the slightly unfortunate situation where you masturbate past the point of no return, but suddenly realise that you don't have a tissue. Or a sock. Or a girlfriend!
Mike: Oh my god what happened your hand?
Joe: Never mind, its only my catch hand!
Mike: That is disgusting Joe
by Highkingofscotland September 04, 2010