derf 

a # between 5 & 6 sometimes used as something you say when you are mad

oh derf! or one,two,three,four,derf,five

derf by mabgywugewinuygcyugbayhgrvn8sb February 9, 2010

Derf 

a fag. one who is constantly a jerk and says bad things about others. sweats profusely, especially from the palms. can be made nice by offering an ultimatum.

I hate that DERF! He always talks about "that guy" that he isn't supposed to talk about.

I hate that DERF! He is so mean!

I hate that DERF! He is writing an incredibly rude and secretive novella about me.

I hate that DERF! Today, he was so annoying I had to pencil-slap him...like 25 times.

Derf by Novella Character #1 May 20, 2008

derf 

1: A ridiculously stupid or dumb person who doesnt understand anything, such as a ditz. 2: Someone who should be a stereotypical blonde, minus the blonde hair.

Person 1: Did you hear that Amie said that 2 + 2 = 3?!
Person 2: Yeah, she's such a derf

derf by BSandB4LIFE July 12, 2006

Derf 

Number between 5 and 6

1 2 3 4 5 derf 6 7

Derf by toesuckingbutthole April 13, 2017

derf 

a exclamtion of stupidity...see also duh

"oh i remember where i put that....derf!"

derf by jaci inspired by alex February 24, 2003

Derf 

A word used as a censor for the word "Fuck". Can be used in any tense that "Fuck" can.

What the derf is that?
May I please derf that bitch?
You are derfing insane, homie.

Derf by Money Blimp February 18, 2010

Derf 

The number between 5 and 6. 1,2,3,4,5,derf,6,7,8,9,10. Most people forget this because Donald Trump just added it to the number system in September 2019. Only the Pre-K classes of 2020 will know of derf.

"OK class let's count those cookies! 1, 2, 3, 4, 5, derf, 6, 7, 8, 9, 10!" the teacher told the kindergarten class.

Derf by TheBojaMaster23 November 20, 2019