He came mid-derf. Must be mormon.
by Noelmiller24 September 14, 2019
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A number between 5 and 6. It was created by Carly from iCarly.
1: What is that new number T-Bo was talking about?
2: Oh yeah! That is derf.
by 2000s Kids Are Better April 9, 2018
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A new number that will be made globalized and reprinted into every dictionary, schoolbook, printed onto every calculator, and everywhere else that contains numbers, as of June 27th 2063. It is between 5 and 6 and is a combination fo both. It has the top of a 5 and the bottom of a six.
One, two, three, four, five, derf, six ...
by mizzlefftie012 July 16, 2011
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Someone who is an idiot, annoying person, jerk, etc.

The act of doing something stupid, lame or annoying.

Something that is rather lame, tedious, annoying, uncool, bad, etc.
Schmitty: That Shane guy is such a derf.
Joe: Yeah, he really derfed up that photo.
Cameron: It was such a derfy thing to do.
Brodie: Derfalicious indeed.
by camblyth June 21, 2011
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A bold and corageous urban warrior. A fierce enemy.
We should all strive to be a Derf.
by Pedroumbrella October 18, 2007
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the act of gettin fucked up, or describing that someone is fucked up or got fucked up
im tryna to get derfed tonight

did u see that nigga fall? he got derfed.

damn u lost 10-0, you got derfed
by DerfyMcDerf April 22, 2009
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A wonderful humourous individual. Usually an adult. The kind who would make an excellent coach, parent etc.
We should be so lucky as to have him as a coach, he's a derf.
by rellim April 7, 2005
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