A beastfriend is a really heinous looking girl who hangs out with a really goodlooking girl. Usually, no article is used. Look at Beastfriend, not Look at the Beastfriend. Example: I was going over to talk to Pamela, but beastfriend was there and ruined it.
BEASTFRIEND
Meaning of BEASTFRIEND in English
Slang English vocab. Английский сленговый словарь. 2012