Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- interj. Chiefly British Used in greeting or parting.
Wiktionary
- interj. a greeting or parting
WordNet 3.0
- n. a farewell remark
Etymologies
- Alteration of cheer.
Examples
“The cheerio is robust enough to float in your milk for some time without succumbing to the dreaded cereal sog, an enemy of mine that rules out the eating of any "flake" cereal.”
“My presonal favorite are the multi grain ones, though the humble standard cheerio is much loved in my house too.”
“Long before we were all fearful and protective and the world was fraught with recalls over choking hazards and worries of childhood diabetes brought on by too much sugar and whole grains were hailed as the new food messiah, the cheerio was the perfect cereal, designed with all of that in mind and more.”
“Just be thankful that "cheerio," "gor'blimey" or "jolly good" didn't show up, since we all know you also use them in every bloody sentence.”
“Unless your reason for living is to play the foil to a self-described cheerio pisser, just let it pass.”
“LOL if your smarts was fuel you would not have enough fuel to power a piss ants motorcycle to do a figure eight inside a cheerio hole.”
“Or if your brains were fuel you would not enough fuel to power a pissants motorcycle to do a figure eight inside a cheerio hole.”
Think Progress » Beck calls Bush a ‘progressive,’ says Obama is doing ‘exactly’ the same thing.
“Oh please dont make me wait,,,, i hate warnings give me more of the same. if your brains were fuel you would not have enough fuel to power a piss ants motorcycle to do a figure 8 inside of a cheerio hole.”
“The best part is watching them eat a cheerio like a tiny donut using their little opposable thumbs.”
“Cameron is a smug self rigteous twit who was a truck driver up here in Ontario (after dropping out of college) and wormed his way into the industry through various dubious means (look them up they are everywhere online). cheerio from ontario.”
Lists
These user-created lists contain the word ‘cheerio’.
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UK Usage - Find US Equivalent
All these terms have a (different) American English equivalent. Wonder if you can identify them?
abridgement (abri..., accoutrement, accoutre, acknowledgement (..., opposite, advert, adaptor, adapter, sticking plaster, advertise, adviser (advisor ..., adze, aesthete and 1196 more...
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Words sung by: Belle and Sebastian
beguiling, herbaceous, peninsula, suffragette, damascan, hastening, berserk, overtime, leccy, bestow, swathe, arab strap and 193 more...

Prolagus Song quotation on canopy. Jun 9, 2009
dontcry I don't know why you say good-bye
I say hello.
Target has totally ruined this song for me...*sniff*
*makes a mojito and goes out to the porch* Jun 14, 2008
dontcry Ciao! Jun 14, 2008
gangerh You say goodbye and I say hello. Jun 14, 2008
Prolagus There's a reference to this word in one of the list with the best names ever. Jun 14, 2008
yarb I have never heard this used to mean 'hello'. Jun 14, 2008
oroboros Like aloha, a contronym meaning both hello and goodbye. Jan 31, 2007