Very slim, friendly to guys, pretty average face, but her ass is the most interesting thing about her. Its PERFECT, in all ways, and compared to most women/girls around. Usually the ass is wrapped in flexible tight grey pants, which excellently outline the ass girl's beautiful curve. Ass girls have the best ass in a given area (mostly in colleges), so the plural term is quite rare by itself.
In addition, this term is used to refer to a ass goddess whose name you dont know.
2."did you see the ass girl today, dude?"