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 21, 2009
to mess up a word by mispronouncing it.
I un-derfed my cat.
by Underfed June 05, 2010
Derf is a very powerful inter-dimensional entity that presides over all things pertaining to video games, technology, and the universal force of awesomeness. Though this is all that he is responsible for, he is still omnipotent and omniscient though usually lets its followers find their own way as long as they stay on the lighter side of morally gray. He speaks in 133t speak and internet slang, has many different personalities (one for each video game genre), and, if you do right by him in life, he will elevate you to the Emerald Arcade, where you will live among the most advanced technology, awesomest games, and a lot of other things. Hey I don't know it was a short conversation.
Dude 1: Man for a while there EA was pretty bad with their games.
Dude 2: I know I wonder why?
(burst of pixels, Derf appears)
Derf: I know I let them come under the influence of the Great Spectator for awhile.
Dude 1 & 2: Let us worship you!
by Derf's Prophet September 22, 2009
Amazing, Happy, awesome.

If you spell it backwards it spells Fred.

A charecter on fred the movie.

The number between 5 and 6!
I feel derf today.

Dude: Hey fred!

Other dude: Yo it's Derf.

Freds twin in the movie Derf.

Kid: 5, derf, 6, 7.....
by scenequeen11 December 30, 2011
a # between 5 & 6 sometimes used as something you say when you are mad
oh derf! or one,two,three,four,derf,five
by mabgywugewinuygcyugbayhgrvn8sb February 07, 2010
1. The ultimate word that can describe anyone or anything. Can be used for describing how uninterested you are, your friends' personalities, music, the world, aliens, cafeteria food, etc.

2. What you name your pet when you can't think of a suitable name.
1.
Dude1: Are you okay???
Dude2: derf...

Dude1: My friends are so awesome they're derf!

Dude2: Arg!!! This country's government is derf!

2.
RandomLady: Let's name our new puppy... Derf!!!

RandomGirl: This is my pet hamster, Derf.
by Mio-chan July 10, 2008
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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