DUFF

(Designated Ugly Fat Friend) A DUFF doesn't always have to be fat or ugly, sometimes a DUFF can be cute, but they're there to make the rest of the group look better and to be the approachable one for anyone seeking inside info.

Man 1: "Hey do you know if that hot girl is single?"
Man 2: "I don't know, go ask her DUFF"

by YolkyYellow March 30, 2015

duff

DUFF means designated ugly fat friend

this person doesn't have to be fat and ugly to be a duff they are usually the one everyone goes to for information on one of the pretiter friends in the group

"why doesnt she get invited to parties, because she's our duff"

by makaaay March 28, 2015

duff bag

A monster tard you work with. Usually nothing good comes out of there mouth. Comparable to douchebag

Duff bag just moves around the office soundung drunk

by Going6to6hell6 January 19, 2017