CHEERIO
adieu, adios, arrivederci, auf wiedersehen, au revoir, bye, bye-bye, cheerio, good-by, goodby, good-bye, goodbye, good day, sayonara, so long
(noun) a farewell remark; “they said their good-byes”
Source: WordNet® 3.1
Etymology
Interjection
cheerio
(British, Ireland, New Zealand, Australia, informal) Goodbye, an interjection said upon parting.
(rare) Hello; a greeting.
Usage notes
Rarely used in North America. Although likely to be understood, it is likely to be considered humorous, and may be used in a parody of British English speakers.
Synonyms
• (greeting): hello
• (parting): goodbye, toodeloo
Noun
cheerio (plural cheerios)
(NZ, AU) A small saveloy often consumed with tomato sauce at parties.
Synonyms
• cocktail sausage
• little boy
Noun
Cheerio (plural Cheerios)
An individual piece of the Cheerios breakfast cereal.
Source: Wiktionary