Typically a knuckle dragging, low foreheaded baboon that has bad manners and is rude to patrons trying to get enter an establishment that serves alcohol. Impossible to talk to or reason with, think they are above everyone else and can ruin a good night out when you haven't done anything to justify either being not let in to a pub/bar/nightclub or ejected from one.
Bill: How come that bouncer wouldn't let you in?
Ben: No idea, I showed him my ID and I hadn't been drinking. they're all unreasonable pricks with IQ's below 10.
Ben: Wow, what a nob, I can't think of any bouncer I've encountered that hasn't been a complete dickhead, unlucky mate.