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A guy who never stops talking and jerking off at the same time, whether he's doing it alone or with a bunch of other guys.
My cousin is a gabblejacker. He talks about his ex while jacking off in the bathroom at the party.
At the gym, the guy next to me was a gabblejacker. He talked about his mom while jerking off.
My friend's dad is a gabblejacker. He talks about his job while jerking off in the living room.