Cheerio
Cheerio definition by Slang.net - The Slang Dictionary
This page explains what the slang term "Cheerio" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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British English speakers may use cheerio to mean "goodbye." This word is a cutesy variant of cheers, which can also mean goodbye.
Cheerio began its life as cheero, before morphing into cheerio in the late 1910s. (Likely because cheerio sounds more chipper.) Cheero may itself have been a contraction of the old school parting phrase "good cheer be with you."