Top Definition
the Designated, Ugly, Fat, Friend. Everyone has one in their group of friends. shes the easiest person to talk to in the group, shes the one to go to when a guy needs to find out where the fit girl in the squad likes to eat out at.
shes the DUFF in our squad
Trafford112 tarafından 11 Nisan 2015, Cumartesi
1 more definition
When you are fucking a girl for the first time anally, you pull out too fast and the girl begins to shit uncontrollably.
Person 1: Dude OMG I heard you got with (girl's name) last night ..
Person 2: Yeah I'd rather not talk about it, it was a bad case of The Duff.
The Duff Veteran tarafından 8 Kasım 2010, Pazartesi

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