Derf 

The act of dry- humping while fully clothed.

He came mid-derf. Must be mormon.

Derf by Noelmiller24 September 13, 2019

Derf 

A number between 5 and 6. It was created by Carly from iCarly.

1: What is that new number T-Bo was talking about?
2: Oh yeah! That is derf.

Derf by 2000s Kids Are Better May 24, 2018

derf 

a slang term for dry humping. Involves sexual contact through clothes

Did you get way derfing her last night.

derf by derfsurfer May 1, 2009

Derf 

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 ...

Derf by mizzlefftie012 July 16, 2011

derf 

fred, spelled backwards

yo derf, did you do your homework?

derf by sakawakag May 7, 2010

Derf 

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.

Derf by camblyth June 20, 2011

derf 

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"?

derf by smrtpnts December 4, 2011