Definitions by BSandB4LIFE

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