Stands for Possibility For Significant Other, a person whom you have a crush on, and you know has a crush on you, but you just haven't started dating yet.
A: Have you and C hooked up yet?
B: Naw, we're just P.F.S.O's right now.
by Joe Jockstrap November 09, 2005

5 Words Related to P.F.S.O

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