Derp is not a word. Even typing it in now, a little red line appears under it indicating it's either misspelled or not a word. So, it's not able to have a synonym.
"Derp is an expression associated with stupidity, much like the earlier forms of interjections like “duh” and “dur.” In image macros, the subject is typically portrayed with eyes that are pointed to each side and a caption that reads “DERP.” The words “herp” and “derp” are often used in rage comics to replace nondescript names or parts of conversation." ~ Taken from http://knowyourmeme.com/memes/derp
Rollback Post to RevisionRollBack
OstentatiousLink Removed characterized by or given to pretentious or conspicuous show in an attempt to impress others.
2010
The reason why I say this is a synonym is because you are asking about a synonym for derp! SERIOUSLY! Who asks that?
一切是真棒!
A wise man once told me that if you win an argument you have learnt nothing.
一位智者曾經告訴我,如果你贏得一場爭論,你什麼也沒學到。
~The_Blocky_Gamer~
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You can just call me Canary.
How not to look like a total fool in the forum games