When the university of oregon ducks are on defense and the crowd at Autzen stadium starts yelling "O" and puts their hands in the air forming an O. This amount of noise(mostly from the student section) causes the team on offense to be unable to communicate resulting in an Oregon win.

(Autzen stadium currently holds the record for the loudest stadium with decibel levels reaching up to 127 DB)
(Autzen big screen says: YELL O)
Offensive player: What was the play again?
Quarter back: What?
Offensive player: What?
Quarter back: I cant hear you, the crowd is yelling "O".
Offensive player: What?
by Ducks12 October 16, 2009

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Top Definition
yello is like hello but its just a better way to say it. Its just another way to say hello, hi, etc
yello!
hey!
What's going on with you today?
by Andrea Pandrea July 07, 2005

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A super hybrid form of both yo and hello, making a super greeting.
<idontthink16>Y'ello
<youarestupid4>What you up to?
<idontthink16>Not much
<youarestupid4>Oh, ok
by Rederickfay April 24, 2006

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A brilliant way of saying hello to someone. Homer once said it.
Homer: Yello
Godfrey Jones: Hello this is God! frey Jones
by Yahegdirf May 26, 2006

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An ambitious Swiss electronic duo comprised vocalist/conceptualist Dieter Meier - a millionaire industrialist, professional gambler, playboy, and member of Switzerland's national golf team - and composer/arranger Boris Blank. They started in 1979 and they are famous for their hit's "The Race", "Bostich" and "Oh Yeah" which was featured on the soundtrack to Ferris Bueller's Day off.
I've been listening to that crazy Swiss group "Yello" a lot recently.
by pwete May 07, 2005

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Informal yet personal greeting, variant of hello
"Yello friend, how are you?"
by Jess November 19, 2003

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Yello.

Is a cross between yes and hello. Most commonly used when people answer the phone.
Yello!

Debbie?

Sorry. Debbie can't come to the phone at the moment. My cock is in her mouth.
by Barney Who-Ah April 28, 2010

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