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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 September 18, 2015
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Aug 3 Word of the Day
Condition which causes you to place an Amazon order, then shortly after remember something else you needed and place another order.
Wow, 10 Amazon boxes showed up on my door today. My Amazheimer's must be acting up again.

Person 1: Bro, your Amazheimer's is getting out of control.
Person 2: It's OK, I have Prime.
by SamboMayhem August 01, 2020
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