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The act of sneaking up behind someone when they are peeing and punching them in the head.
Griffith, having been pushed to his limit, urinal-punched Logan in the bathroom.
by Billy-Hill February 19, 2018
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The act of hitting the guy standing at the urinal next to you while taking a piss with the other hand. Not to be attempted when inebriated beyond a certain point.
Man, I so Urinal Punched Woollard so he pissed over his shoes!
by M-Train#51 February 03, 2011
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