Top Definition
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 ...
por mizzlefftie012 15 de Julho de 2011

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The face a dog makes when he or she tilts his or her head and looks inquisitive or confused.
I threw the ball and Rover just looked at me like, "derf"?
por smrtpnts 04 de Dezembro de 2011

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a slang term for dry humping. Involves sexual contact through clothes
Did you get way derfing her last night.
por derfsurfer 30 de Abril de 2009

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Noun:
Someone who is an idiot, annoying person, jerk, etc.

Verb:
The act of doing something stupid, lame or annoying.

Adjective:
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.
por camblyth 20 de Junho de 2011

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fred, spelled backwards
yo derf, did you do your homework?
por sakawakag 06 de Maio de 2010

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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
por DerfyMcDerf 21 de Abril de 2009

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Doesn't ever Research Facts

Noun: A failed attempt to satirize an idea due to lack of comprehending said idea.

Verb: Failing an attempt to satirize an idea due to lack of comprehending said idea.

Person-describing noun: A person who's failed an attempt to satirize an idea due to lack of comprehending said idea.
This stupid Facebook repost from FOX News is such a DERF.

Some crazy door-to-door preacher came over and DERFed for ten minutes about how bananas prove Creationism.

He says I'm going to jail for cutting off a mattress tag. What a DERF!
por Logic-Bomb 25 de Julho de 2014

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