Any worthless person with a total lack of consideration for others. They include homeless people, ultra-hippie tree huggers, ultra-religious extremists, stupid people, cyclists who attack cars, car drivers who ignore cyclists, a self-entitled child, a self-entitled child's parent who caused his or her precious little snowflake to act like an ass, others like them.
"Could you turn off your cell phone and wireless router? They give me headaches."
"No they don't, what are you talking about?"
"If you don't turn them off, I'll sue you!"
"Fucking rock stacker..."