by Blaze4lifemothertruckers March 10, 2020

When a computer or it’s software crashes, particularly a Commodore 64 in the 1980s, often at the worst possible time.
Felix (in the factory) has duffed! I’ll never beat the high score now!
Football manager has duffed! Right in the middle of the F.A. Cup final!!
Football manager has duffed! Right in the middle of the F.A. Cup final!!
by BBarnet November 6, 2019

by Smoker91113 April 24, 2009

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

Duf is a ugly fat girl in your friend ship every body has one and there friend is much hotter than she is
by Duf4466 June 23, 2020
