Hair Of The Dog Club. A group of people attempting to remedy a hangover by ingesting the "hair of the dog", i.e. more alcohol. Can also be used as a verb: "to HOTDC", meaning to participate in the Hair Of The Dog Club.
"Dude I got so drunk last night after the Redskins spanked the Cowgirls, let's hit Whitlow's and HOTDC this bitch!"