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an ass hole. Named because it is round like a cheerio and has a little hole in the middle.
Cats stick their tails in the air to show everybody their cheerio
cheerio by Brianne1979 January 6, 2006
All of these definitions are wrong. A cheerio is when you trick someone into looking at your hand while forming a circle with your thumb and your index finger while the rest of the fingers are extended. The person who looks then has to let the person who tricked them punch them in the body or limbs. Etiquette dictates that the Cheerio should be below the waist when viewed.
Cheerio, bitch! Give me the left arm!
Cheerio by Zehcnasytrid December 23, 2016
A 'Cheerio' is a nickname for an Anus, Bumhole, Arse etc...
You better not stick that in my cheerio!!
Cheerio by Chocolate Wrists December 3, 2018
When a woman’s vagina is so tight the size is comparable to that of a single cheerio cereal.
She got that cheerio, bro!
Cheerio by Cheeriogirls February 18, 2020
A Beautiful Girl: Ridiculously Hot Girl
Derrick- Cheerio!
Daniel- Where?
Derrick- In the blue shirt.
Daniel- Wow she's definitely a cheerio!
Cheerio by NoahK October 9, 2010
A young boy, fourteen to be exact, and a member of the xbox-scene forums, who was repeatedly raped by an uber nerd canadian forklift driving midget pedofile named HSDEMONZ.

He shall be missed.
1. Cheerio committed suicide earlier this year as a result of being repeatedly raped by HSDEMONZ.

2. If HSDEMONZ would have taken the time to take the dildos out of his own ass, he might have realized what cheerio actually mean't to him.
cheerio by The Allies May 29, 2004