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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.
(D)esginated (U)gly (F)at (F)riend
You are a duff
We have a duff in our friend group
That place on the human body (particularly the female body) where the body makes contact when sitting-down, i.e. the erogenous area of the butt.
The shake at the bottom of a bag of drugs, including the seeds and stems in a bag of weed. Commonly used to describe the shake at the bottom of a bag of crystal meth.
Jeff: Hey, let me get a ball of that fire ice. Dan: All I have left is the duff, bro.