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One's close or closest friend, especially someone with whom one enjoys spending time or sharing activities. My wife and I are also boon companions—we do everything together!
See also: boon
One's close friend. Oh, I'm sure he invited Dave—that's his ace boom-boom.
A reclaimed term in the black community for one's close friend. However, it is potentially offensive due to "coon" being a racial slur. Oh, I'm sure he invited Dave—that's his ace boon-coon.
ace boom-boomand ace boon-coon
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?
See ace boom-boom
in. to leave the road in a car for the boondocks. Tom has a four-wheel-drive so we can really boon!
A favorite friend, a convivial associate. Now on its way to obsolescence, the adjective “boon” comes from the French bon, for “good,” and has meant “jolly” since the twelfth century. As for the pairing with “companion,” several sources cite the Roman epigrammist Martial, who wrote nulli tefacias nimis sodalem, which has been translated as “to no man make yourself a boon companion.” The association with drinking was made explicit by John Arbuthnot (The History of John Bull, 1712): “A boon companion, loving his bottle and his diversion.”
See also: boon