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1. To become an officer after serving as enlisted. Origin: military.

2. Go renegade and betray friends and allies
1. Corporal Hanson is sure to go mustang if he stays in. He's smart and has his shit wired high and tight.

2. In 1990 Iraq went mustang and screwed over all of her allies when they invaded Kuwait. Origin: uncommon slang.
by james savik August 12, 2015
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Apr 21 Word of the Day
I've been jabbed
by Francesco II March 20, 2021
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