Top Definition
The unholy union of the words 'moo' and 'ass'. Moo comes from the meaning when you need to say something but cant think what. Ass is there to enforce the word, it's usually used as a exclamation of fear or shock.
*nearly steps on dead thing

"MOOASS!"

*sees something amazing

"Mooass..."
by Phoebe Zacks April 25, 2004

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