14
A person of unusual agility and skill.
I don't really want to play her. I hear she is a derf.
by 2forme November 12, 2007
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15
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
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17
A stupid idiot, maily Shane Hyatt
Shane Hyatt is such a derf
thats a derfy idea (plural)
by ur mummma August 26, 2008
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18
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
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19
Synonymous with a skilled ninja. Often used to describe a quick and fierce enemy who is extremely agile and deadly.
Person #1: There's that girl Sarah, lets go beat er' up.
Person #2: Fuck that! She's a derf! Im leaving her alone.
by Slimescree December 17, 2007
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20
An idiotic person beyond the conceivable threshold of stupid.
That guy who cut me off is such a derf!
via giphy
by Corgiprincess100 August 18, 2020
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