What does DERP mean?
A derp is a dumbass and a derpina is a girl dumbass.
Other definitions of DERP:
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How to use the term DERP:
what a derp, he just ran over the sidewalk
More slang terms:
Oh, I See You Ate One Too
By the way, I think I am in love with you
Wit-less One Line Follow-up
Don't Know For Sure