Two hot chicks at school they usually have a ugly nasty ass friend but this friend is one that their close with . Say a fit boy walks past the duff of the group they only talk to her to get into her pants
(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