Sleeping with two or more people within 12 minutes of each other. Derived from irish twins.
What did you do after that party? Wait, you nailed a chick from Suffolk and a Canadian 10 minutes later? Amazing! You had an Irish Threesome.
by the nomadic viking October 21, 2010
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Having sex with two girls within a 3 day period.
Cody got his penis chopped off when Verna found out he had an Irish Threesome with her and Laura.
by Jp3 July 22, 2014
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