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1.
to use ones stream of urine to spray off the bits of feces stuck to the inside of the toilet.
"dude dont poop so much, i had to fire hose the toilet"
by jim May 07, 2005
 
2.
when a guy pees in a hurry and forces the urine out faster than the normal pace it would flow at. usually in an attempt to quicken a trip to the bathroom or because of an unbelievable and urgent need to piss.
Dude, I had to walk home from school in the rain. As soon as I got through the bathroom door, I was firehosing like a motherfucker.
by vikeaio January 11, 2011