abv. for Designated Ugly Fat Friend; Term men use to describe a fatter, less attractive friend, a woman brings with her to a party or social gathering to make herself look better by comparison. In some cases the more attractive woman will not "put out" for any male, unless one of his friends "takes one for the team" and "hits" the Duff.
C'mon take one for the team and hit that Duff (D.U.F.F.), I'll buy you lunch tomorrow!
by Dr. Slappy McGee III Esq. March 7, 2006
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