36
The reverse of the name "Fred". Commonly used by people who are either trying to be silly, those who think that it's a cool name and didn't like being labeled a "Fred", and those who truly think that it's a great pseudonym and no one will ever figure it out.
Overheard at a trekkie convention:

Fred: "Dude, I'm so awesome, I'm gonna reverse my name and call myself Derf."
Clueless friend: "Dude, that's awesome!!!"
by Octoboi June 26, 2007
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37
(Definition 1): The extra skin that allows your balls to swing out, so you don't shit on them. (Although usually covered in hair, there have been reports of hairless and albino derf spottings in the wild);
(Definition 2): sweaty, stinky, beneath you, Flappy Fringered Bassist
(Definition 1): This Guy I know was in a bad car accident and broke his derf. Doctor told him it might never be the same.
(Definition 2): That guy they caught spanking it in the Mens room is such a Derf.
by Jaysmoka April 15, 2007
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38
A derf is another word for the unwanted. the person no one wants/need. the loner. the suspected pshyco killer. it can also be another word for tool, widely known as somebody no one needs (annoying). an extremely BIG insult.
Can you believe that effing Derf? what a tool!
by CoUnTrYwOrLd July 06, 2011
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39
Number between 5 and 6
by This_is_sara_ April 13, 2017
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40
The number between 6 and 7
"Yo what's that number"
"Nigga, it's Derf"
by killingbird September 09, 2016
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