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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...
by You Wont, No Balls May 15, 2011
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