derp

Etymology
Probably from, British informal exclamation for “stupid” or from , an exclamation indicating faltering speech and assumed stupidity, glottalized for emphasis. Popularized by ' (1998) and "", a 1999 episode of '. See also possibly related to Welsh twp meaning fool.

Interjection

 * , blah blah blah.
 * , blah blah blah.
 * , blah blah blah.
 * , blah blah blah.

Usage notes
In the placeholder sense, often used with. Can be used like a noun or a verb or with various suffixes. Connotes that whatever it stands in for does not matter, and often that it is foolish or nonsensical.

Verb

 * 1)  To act stupidly or foolishly
 * 2)  To make a stupid mistake
 * 3)  To point in different directions;  To have a facial expression with one's eyes pointing in different directions.
 * 1)  To point in different directions;  To have a facial expression with one's eyes pointing in different directions.

Noun

 * 1)  A person who acts stupidly or foolishly; a person who derps.
 * 2)  A stupid mistake, stupidity.
 * 3)  The constant repeating of an opinion after facts have proved it incorrect, especially as a rhetorical tactic.