Some weak ass punk kid who yells shit out at you from the passenger side of their friends car . Usually something like "Pussy", "Fag", "Fuck you", or some other bullshit to make them appear tough. If they were in any real situation where someone could retaliate they would never say such a thing.
Friend: "Dude some asshole screamed some shit at me for no reason while I was walking over to your house."
You: "Lol, really what did they say."
Friend: "I don't really know some shit like suck a dick or something."
You: "Ohhh a Window tough guy, I got it now." "You should just carry a rock in your pocket to throw at those assholes."