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10.
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
 
1.
a slang term for dry humping. Involves sexual contact through clothes
Did you get way derfing her last night.
by derfsurfer April 30, 2009
 
2.
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 04, 2011
 
3.
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 15, 2011
 
4.
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 20, 2011
 
5.
1. To get a stamp on your completed homework.
2. To act crazy and/or insane while teaching or just talking in general.
3. To yell at one's smart board.
4. To flick off one's class.

5. To stand on a desk to feel if the air is working.
6. To teach "shit"
7. To throw markers at ghetto kids.
Person A: "Yes I derfed my homework!"
Person B: "Ugh, lucky, I skipped one problem."

Teacher: "You guys forgot your calculators?!!!!" "YOU'RE ALL LOSERS!!!!!!"

Teacher: (to smart board) "WHY ISN'T THIS THING WORKING?!"

Students: (to teacher): "Happy Birthday!"
Teacher: *flicks off class and walks out*
by calculusstudent November 23, 2012
 
6.
fred, spelled backwards
yo derf, did you do your homework?
by sakawakag May 06, 2010
 
7.
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