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.
Duff is a quiet man when you first meet him yet is incredibly observant and always listening. He takes his time in both thoughts and actions, but in the end is always ready to share the very best of himself. Duff is strong yet gentle, firm yet kind and mushy. If you are lucky enough to have a Duff in your life, then you are guaranteed a funny and generous confidante who will be by your side forever.
You know it's going to be a great night, Duff is coming!
(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.
Duff the DESIGNATED UGLY FAT FRIEND as a duff i would know its not fun ,sometimes u get ignored by ur friends and you feel left out
"I was a DUFF back in middle school."