The unattractive, and usually fat, slutty girl at every party. Hump Whales usually think that they're hot, but they really aren't. They are just used as back-up hookups when guys can not get a hot girl at a party. Hump Whales are quick to get drunk (usually faking), loud and obnoxious, and will flirt with and hook up with any guy they see.
Guy #1: Why are so many guys all over that girl? It's not like she's attractive.
Guy #2: Dude, there's like a 1:4 girl to guy ratio at this party. She's the Hump Whale. It's her time to shine.