Pan
A female whose sexual partners exceed her age by a shocking number, often disposing of unborn children at an alarming rate all while keeping the neighborhood rape rate at pleasant lows. This "pan" is often the butt of jokes for men who are either as promiscuous as said pan, OR girls who are also as bad, but keep it generally under wraps. Much like junk food, sleeping in tents or Tim Tebow, a pan can be quite the double-edged sword and should be utilized with caution.
Guy 1: I just did it with Sarah, I just started talking to her about 3 hours ago though she didn't even take my number, just bus money.
Guy 2: Me too.. so did Mark, Jim, Tom, Larrry, Mike, Rudolph, Lenny, and Larry again.. she must a pan!