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1. Someone that starts fabricating heritage to Ireland around St. Patricks Day as an excuse to go party.
2. Someone that acts like they know the words to Irish Music while at the bar on St. Patrick's Day.
Look at that guy slamming back the green beer, he's a St. Paddy's Day Poser. He told me last week that he was Polish.

Yeah, I bet he thinks the ISH on end of Polish will pass as Irish.
by OMGyouwillseethis February 12, 2010
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