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Mother Of All Secrets, the biggest/serious/interesting secret a person can have without exploding.
"Tell me your biggest secret..."
"No way man, I'm not telling you my MOAS!"
by Lola1985 September 16, 2008
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Her - OMG! I just saw on facebook he's dumped the bitch he cheated on me with and is now going out with a duck-faced oompa-loompa. I can't stand seeing him with all these girls when he could have been happy with me!!!

Me - FFS MOA!!! He's a douche-bag. Rise above it coz ur not gonna find anyone else by sitting at home stalking the prick!
by International Gypsy November 03, 2012
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An acronym for Minuet of Angle. It is a angular measurement of exactly 1/60th of 1 degree, commonly used in astronomy and ballistics, and any other field that requires such minute measurements.
M4's are guaranteed to have a sub-MOA grouping when properly shot and zeroed.
by lurch/brittney/creepyguy August 18, 2011
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5
In Sweden during the lates 12th Century. The Swedish police went to New Zealand. They brought back tales of incredible flightless obese birds. They tasted similar to their mothers.

Thus the Swedish word for Mother was transferred to the bird.
Swedish mothers still give this name to their children when they remind them of such birds.
It is also a double bluff.
'Man that is one damn big baby!'
'Yeah such a Moa.'
by Gavin Hughes, Aberdeen January 16, 2018
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I heading to the gym to get some MOA!

Or

Dang girl! Have you been working out? You have some fine MOAs.
by meanderer April 22, 2009
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Military Operations Area

Areas on aeronautical sectional charts designated to be known areas of military aircraft operation. Pilots are encouraged to use extreme caution when passing through a MOA
MOAs are most usually found in and around military air bases
by Av8tion March 09, 2006
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