n. one's good and loyal friend. (Black. Ace boon-coon is not as common as the first entry and is objected to because of coon.) : Hey girlfriend, you are my ace boom-boom. , Where is my old ace boon-coon, bro?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw-Hill Education.
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