The assault, by accident or by intent, of a one's breast(s)by another.
Did you see that? That frakin' jerk just totally delivered a bamm-o-gram to that chesty girl over there!
The act of, or knack for, being / behaving like a jackass by either word and/or deed.
While at the movies last night, some bluetool committed jackassery by answering a call and talked loudly through most of the film.
