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.
by camblyth June 21, 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"?
by smrtpnts December 4, 2011
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Verb: to Derf is to purposfully send someone the wrong way, or to trick someone into going the wrong way. You have to strike it with such confidence and not to stutter that they do not second guess you and still believe they are going the right way. Even when they know they have gone the wrong way, they blame or doubt themselves.
This guy asked me for directions and I totally derfed him.
by Joeseppe July 15, 2019
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The process of: executing a handstand; masturbating during handstand; ejaculating in direction of mouth; regaining post orgasm senses and gracefully avoiding free-falling wad. A professional sport in parts of Oregon.
Did you hear Sunshine Bear died while in the derf last night?

No…how?

His dad caught him in the act and beat him to death.
by Lupus Lavign. July 12, 2006
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Kick-ass cartoonist. Draws & writes 'The City'. Created 'My Friend Dahmer'. Not respected by enough people.
by Raewyn June 15, 2004
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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!
by Logic-Bomb July 25, 2014
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to mess up a word by mispronouncing it.
I un-derfed my cat.
by Underfed June 5, 2010
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