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1.
(verb) To spin and/or twist while urinating, so one can piss on everything in sight in a given area. Frequently done in anger or while drunk - or both.

(noun) The act of performing a piss sprinkler.
The waitress in the Rodeo Bar was a real twat, so I piss sprinklered the entire bathroom before leaving last night.
by FreeFall the Psychaderelic October 03, 2010