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(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"
The action of folding someone, or knocking them out
“Man I’ll duff your shit”
“Oh shit, Amari got duffed
dumb ugly or fat friend...
Becky invited her duff so she doesnt get wasted and blows any willing cock within sucking distance
Designated Ugly Fat Friend is a person that you keep around to be more attractive and popular also known as the D.U.F.F
Two hot girls are sitting with a ugly girl. I feel bad for that Duff.