"this is not a drill message" -- implying the following messages are not simulation or exercise related message but of vital and usually life/death importance
"Charlie one five, Zulu four zero, no duff message, Zimmerman is down, Zimmerman is down"

"Zulu four zero, charlie one five, medic on the way"
by Shizuma April 15, 2008
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A Scandinavian drinking game that can be played by two or more players.

Played in a circle the participants hit a beer can against their head twice with considerable impact (hence duff duff) and then pass the same beer can to their left. The next participant does the same and that continues until the can springs a leak.

The person whose head caused the leak then needs to open the can and down it.

The player to the loser's left takes a fresh can and the game continues.
This drinking game should only be played by skilled experts.

Duff Duff is often played at men only events such as but not limited to: camping trips, bucks parties and festivals.
by Gazcap January 24, 2012
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the Designated, Ugly, Fat, Friend. Everyone has one in their group of friends. shes the easiest person to talk to in the group, shes the one to go to when a guy needs to find out where the fit girl in the squad likes to eat out at.
by Trafford112 April 11, 2015
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to throw a severe beating to another person or group. Used with mal intent or to beat the ass's of.
"If you don't shut the fuck up, i'm gunna duff your dumb ass"
by DamionFK December 01, 2006
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A term that was popular in the early 2000's and is an acronym for "designated ugly fat friend." In modern day, this term is only used by douches who can't keep up with current slang, and by stupid ass middle schoolers who think they are the shit because of the 2015 movie of the same title that attempted to resurrect the term and make it "cool."
Stupid Person 1: Why is that ugly bitch hanging out with those hot girls?
Stupid Person 2: She must be the DUFF.
by yoloswagturnupyoo February 27, 2015
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