Desiganted Ugly Fat Friend. A common acronym used in male cliques. Used to refer to the girl that the "hot chicks" bring along to distract the "Wingman" (every male clique has one, his job is to intercept the DUFF.) so the ycan have the more desirable males of the group.
by TXwolfman817 February 24, 2009
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Get the duff sack mug.Verb (past tense) : The act of being penetrated in one's anus by sac encased male genitalia. Often leads to a tearing of the inner anus, causing the need for stitches. Causes sticky situations when the Duffer has to tell the Duffee's parents.
by NeverBeenDuffed January 26, 2009
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