Guitarded

That derpy face people make when playing a guitar.

Check out Temu Jimi Hendrix over there getting guitarded.

Guitarded

The state a guitarist enters when playing that is accompanied by a grimace or contortion of the face that makes them appear to be mentally challenged. A portmanteau of "guitar" and "retarded".

"DId you see the solo that Jerry busted out? Dude got guitarded."