verb: to do something stupid, immature. to lack rational judgment.
noun: the space underneath a man's scrotum before his anus; a normal person minus reason and accountability.
I can't believe I stapled my scrotum to my chair again. I really pulled a derf.
Dude, you only worked 3 hours today, don't pull a derf.
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More fondly refered to as "derf" or "derf-derf" he is the most idiotic and worthless kid in my psych class. He laughs at everything you say to him which more often than not is an insult, usually referring to his step-mom who has fake titays.
hey derf, you ever see your moms fake boobs? cause you are worthless like that
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noun: An inept or foolish person, someone who doesn't use their head. On the PLATO computer system of the 1970s (which in many ways foreshadowed the Internet), a derf was one who left their computer terminal without logging out.
verb: On PLATO, a prank played on a derf. Sending out unpleasant or embarrassing messages under the handle (or "signon") of a person who'd forgotten to log out. Or ruining programs they've been working on.
noun: Wow, "Melvin of MIT" is a real derf! Look, he just walked out and left his terminal logged in.
verb: Hey Melvin, I just tried to run one of your programs and it looks like somebody got into it and put in a bunch of porn. Looks like you got derfed!
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When one of your friends attempts to become the incredible hulk when drunk and no one will give them more alcohol.
Fred went derf smash on the table and broke it after everyone hid the alcohol from his drunk ass.
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an expression which has recently spread through out the Vancouver area, which means to sniff some cocaine.
fuck man, last night i snerfed way to much derf.
I just picked up and 8 ball. get ready to snerf derf!
a retartedly, annoying white girl; usually very ugly
that stalker gurl is a mad derf
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The act of 2 buck naked men in a horny frenzy come together taint to taint and mash them together until the sweat mixes with ass juice forming a burnt buttery looking substance that smells of Axe body spray, Ball sweat and Shit!
By the smell of him, I'd swear he was out making Derf Batter last night!