When your poop contains enough water to spray.

Also, a Cleveland Steamer gone horribly wrong.
Gah, just had a fire hydrant from that burrito yesterday. That skeezar waitress must have put something in it.
by Tray Graham March 25, 2005
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When the girl you're hittin' doggie-style throws up mid intercourse. "Hydrant" because of dogs and doggy-style. Harlem because of how the fire department opens up the hydrant spout on hot summer days so the kids can play in the spray.
Harlem Hydrant!
by posaune1 June 4, 2011
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Getting blood over your dick after rooting someone up the ass.
I was rooting that girl and got a fire hydrant last night.
by OldManSack February 7, 2012
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The acting of violently spraying a liquid, often blood. Visually what happens if you hit a fire hydrant. Common to graphic films and murder scenes.
Ohh Shit! That guy cut off my arm and now its fire hydranting!
by L. Lawliet March 13, 2008
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Term that describes one that is a douche, douche bag, douche nozzle, jackass, fucker, asshole, etc.

Person 1: That guy was such a douche
Person 2: Yeah, a big one too, pretty much a douche hydrant all around.
by Junta December 17, 2006
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The act of a man or boy of having a boner
a fire hydrant is an inside joke used between my friends.... meaning when a fugly guy sees a hot woman (us) and gets the urge to come and fuck us getting a boner.
by Brosephine kasberger January 23, 2017
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Inappropriate acts seen in public, such as dry humping inanimate objects
They saw a boy on the street having a little "too much fun" and called out "fire hydrant"
by Mollythemallcop September 25, 2018
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