When there's a group of hot chicks, slam pigs
no doubt, it often includes one girl who is fuckin ugly. This is the goon bitch. She is not only less attractive, but she is also a massive (not literally, necessarily) cock block
. Consequently, she spends a lot of time interrupting your conversations with the hot girls.
The two major qualifications, provided that she is in a group of hot chicks, are heinousness and a Ph. D in Cock Blockery.