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The act of passing gas while standing at a urinal. Sometimes the trip to the urinal is made solely for the purpose of the urinal fart. Females are unable to partake in the urinal fart...for obvious reasons.
Man I've got to fart really bad I need to go make a urinal fart.

Did you hear that urinal fart, he must have been holding that ll day.
by Manic Med Student August 23, 2006