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1.
A facial expression reminiscent of one who is retarded. It often involves eyes turned in different directions and a stupid smile.
In reply to that idiotic comment, I posted a picture of a retarded facial expression with the caption "This is my derp face."
by Banky Edwards February 09, 2011
101 58
 
2.
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!
by B.H from SPHS October 16, 2011
4 8