When one of your friends attempts to become the incredible hulk when drunk and no one will give them more alcohol.
by Steve_42 January 22, 2009
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Get the derf mug.When a persons expression of his/her face or reaction is considered derping, hence the word "derpface"
Jan: Guess who just got laid?!?
Joe:*makes a derpface, i dont know, you?
Jan: knock off the derpface! your creeping me out!
Joe:*makes a derpface, i dont know, you?
Jan: knock off the derpface! your creeping me out!
by B.H from SPHS October 16, 2011
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