What is Ass Dancer?
A man who dances using excessive pelvic thrusts and general overuse of his posterior, for the purpose of drawing ladies' (or mens') attention to it.
man # 1: "did you see carl out there on the dance floor"?
man # 2: "yes, he was shaking his ass all over the place"
man # 1: "that guy is a shameless ass dancer all right".