a girl (or guy) who does any and everything, for every and anyone, and is well known for it. This person is usually well known in their neighborhood, borough/county, or town for this.
They are notoriuosly known to give head
to anyone who asks for it.
person1: OMG did you hear, Sharlene tottaly sucked of Michael and two of his friends in the back staircase at school yesterday.
person2: Eww, she's such a pop