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it's used as a greeting, whether it be in person or over text.
"yooo, what's up dude!!"
by 1dasfrick March 27, 2016
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You're Only Old Once. Pronounced like "Yooo..."

Like, YOLO, but for old people that works for outrageous or completely mundane events.
"Hey, want to stay in and watch crime dramas all night?" "YOOO!"

"We flew to a lawless island in the Caribbean to do a shitload of blow and almost kill ourselves, I mean whatever right? YOOO!"
by jenqueue October 18, 2017
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