In baseball terminology, a brushback is a pitch, often used for intimidation purposes, thrown near a batter's head. A pitcher will throw a brushback if he thinks the batter is crowding over the plate, is being a showboat, or for retaliation.
Brushbacks can result in warnings, ejections, or even bench-clearing brawls.
Nolan Ryan threw a brushback at Robin Ventura years ago...and then proceeded to administer a grade-A asswhoopin' on the poor guy.
Someone who searches wooded areas in local parks for homeless camps or other squatters,this may sometimes be the police, sometimes a resident from a nearby neighborhood, or occasionally another homeless person. Bushbeaters almost always do so with ill intent, either to force the squatters to move on, trash the camp, or to rob them of whatever is not nailed down.
Bum 1: "Good thing I got back to camp when I did, a couple 'a bushbeaters came through lookin to mess with my shit!
Bum 2: Man, that woulda sucked, big time, pas me that bottle!
When you draw or paint something that would be embarrassing for real life people to see, like homoerotic fanart, genitalia, porn or My Little Pony, and someone you know accidentally sees what you are drawing.