When a man gets horny and ejaculates against no friction, therefore does not penetrate any orifice or use his hands or thighs, usually occurs in adolescent boys who have never wanked for the first time.
Guy #1: I didn't know what wanking was until one day I was watching porn, got a boner and jizzed in my pants without using my hands.
Guy #2: Oh shit you had a 'houdini wank'
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