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1) an expression of self-disgust in one's actions.

Circa 1984. "Moof, Moof!" was exclaimed by a friend after exhausting all efforts to find a word to discribe his embarassment after his inability to complete a rather simple task.
The waiter exclaimed, "Moof, moof!" as the tray of glasses he was carrying fell to the ground.
by YTBOY April 16, 2004