Top definition
The act of a gentlemen urinating in the urinal , while the urinal spews his own urine back at him .
Me : hey bro i gotta take a leak .

Friend: alright man

Friend (5 mins later) : dude what happend to your pants?!?!
Me: oh yeah , i had some "urinal backfire" if you know what i mean.
by Exotic guy December 03, 2013
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