An acronym standing for Pretty Fucking Close.
It is usually used in a demeaning manner implying the action wasn't possible by the person who attempted it.
PFC can be either an action or a person, someone who almost does things or something that almost happens.
1: "Dude I was talking with that girl for a while."
2: "Did you get her number?"
2: "Haha that is almost awesome, instead you just got PFC"