Crossword Genius

"I'm such a moron!” (3)

Ross

I believe the answer is:

doh

(Other definitions for doh that I've seen before include "First note of musical scale" , "First and eighth note in tonic sol-fa" , "annoyed expression" , "Tonic (mus.)" , "whoops!" .)

I've seen this clue in The Wall Street Journal.
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