Derp

Definition from Apple Dictionary
derp  |dəːp |   informal

 exclamation  (also  herp derp )used as a substitute for speech regarded as meaningless or stupid, or to comment on a foolish or stupid action:  Lower tax rates and far lower job creation. Derp. noun  [ mass noun ] foolishness or stupidity:  the derp heard outside apparently was only the tip of the iceberg.

ORIGIN  1990s: probably an alteration of  dur  or  duh.

Definition from Other Places
derp  |dəːp |   informal

 Noun

<span class="lg" style="color:rgb(0,0,0);font-family:Baskerville;line-height:normal;"> A disease caused by an unknow virus which will cause people to have square eyes and act weirdly: Yesterday night, I caught the derp.

Verb

To do anything after catching the derp disease or acting like someone who caught the derp disease: For unknown reason, Ray derped in my house.

<span class="gp ty_label tg_etym" style="margin-right:0.4em;color:rgb(0,0,0);font-family:Baskerville;line-height:normal;">ORIGIN  <span class="dg" style="color:rgb(0,0,0);font-family:Baskerville;line-height:normal;">2013-2014 <span style="color:rgb(0,0,0);font-family:Baskerville;line-height:normal;">: The first person who caught the derp disease says derp for the most of the time.