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.
"Man, my butthole hurts! I really got Duffed last night!"
by NeverBeenDuffed January 23, 2009
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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!!
by BBarnet November 06, 2019
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me and angel was so duffed last night we left the car on the whole night
by mhndzxo February 12, 2017
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A Dance involving flailing your wrists around like a demi-incapacitated flamer boy.

Also used to describe someone or something that is not particularly pleasant.

For example, someone who is jammin out to K$ sipping on Sangria would be Cham-blammin', whilst someone who is sitting with their great aunt Agnyes laughing about the ultimate Republican goal of complete female opression/obliteration would be Muf-Dufin'.
Me- maaaan, I can't hang out at this club breh, too many people are Muf-Dufin'. Dis bitch just spilt her drink on me.

Yo maum- you're right, lets go somewhere the people can truly Blam their Cham.

(bitch spills drink on yo maum)
Yo maum-MAN, YOU CAN DUF MY MUF, TRICKASS HATER
by Burtoneous Maximus May 02, 2011
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The sexual act of penetrating a female's vaginal cavity whilst they vomit.

partnered with the act of Vom-Chuffing
"whilst she was bent over throwing up he began Vom-Duffing her to her suprise"
by RahimTom June 03, 2009
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