It is just like a threesome only it goes on forever.
guy 1: OH man! Last night my gf and her bestfriend had this threesome and god it just went on and on!!

guy 2: You mean a pi-some?

guy 1: A what?

guy 2: You know its like a threesome only it goes on for what seems like forever?

guy 1: I guess you can call it that.
by smileYourOnCamera September 14, 2009

7 Words Related to pi-some

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