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Peeing over the top of one's waistband rather than through the zipper, using the penis like a hose. Usually done at a time of rush leading to a high pressure relief, thus the fire hose.
Nick: Hey man, did you make it to the bathroom in time?
John: Yeah dude but I was wearing these stupid button up jeans so I had to firehose it so I didnt piss myself
by mr_t January 01, 2015
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