A sex act where a gentleman releases a stream of urine into his partners asshole while that person has their buttocks angled uniquely in such a way to recieve the piss into their gaping rectum. the stream of piss is what resembles a streamer. (Note: originated by the Greeks, Stolen by the Irish.) The Irish Streamer is usually initiated by the subject exclaiming "PISS IN MY ASS!!!"
Amanda gave Brian a fantastic Irish Streamer in the heat of Passion.
by mike dravis August 17, 2005

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