Abbreviated as "SEF"
The friend(s) of a highly
attractive girl who's sole purpose is to make the
attractive girl feel better about themselves and look perpetually times more attractive to guys.
Also, the SEF serves a double purpose as a
cockblocker
Charlie: Yo check out that slut over at that table, shes
hot as fuck. Im'a go
get that.
Justin:
Yeah dude, but check out all her friends.
Charlie: Fucking Self Esteem Friends...