What does the word "Derp" mean?
It means:" reply to a stupid comment or action". See Internet slang:http://www.internetslang.com/DERP-meaning-definition.asp
It could be an expression that doesn't realy have a meaning.
It's means, the person who's using it is an idiot. Stay away from them.
derp is a term for a retard or some really dumb person. it also means u are spazzing out! haha such a fun word!
Derp means retard or dumb person such a rude word don't you think.At least I think that is what it means.