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quite possibly the greatest mascot ever to be made in history. period.
duffman by Anonymous October 11, 2003

ooo-duffman 

Effect of a certain drug when consumed by a certain type of person
Joel ran in a euphoric state and screamed at the top of his voice "ooo-duffman!!!!!"
ooo-duffman by steff November 5, 2003
one who provides beer
duffman by Laura D April 24, 2003
Duffman is so sexy
Duffman by Jetmouse3000 March 1, 2021
A former regular at the now non-existent TFC server Edmonton Elite, which ran and had its heyday several months before the collapse of the World Opponent Network for all half-life games until they would only be accessable officially through Steam.

Duffman started out as a fair person, until he started getting jaded as he got closer to winning admin powers, from which point he became hypocritical, excessively stubborn, self-righteous, and saw things only from his Pov. See egotist. Not much is known from his reign as an admin of said server, although more than likely he still had these same traits, stubborn as he is.
He tried to be a good person but still failed at it, as his ego has got the best of him, and his stubborness
Duffman is not worthy of being named the Duff-man from the Simpsons
duffman by Lethys July 22, 2008
Duffman - Quite possibly the gayest mascot ever to be made in history....period.
Duffman...sucks!
Duffman by Alex McCaffery December 16, 2010