The face that one makes when coping with a chronic problem, to the point where it seemingly has become permanent.

Also PBF.
Person #1: Hey, have you seen Lisa lately? I haven't heard from her in a while.

Person #2: I'd stay away from her until she comes to you. Last time I saw her she had her PBF on.

Person #1: PBF?

Person #2: Yeah, bro. Permanent-Bitch-Face.

Person #1: Whoa, yeah, okay. Thanks for the warning, man.
by pbfman April 27, 2014
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