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A Hanna-Barbera canine cartoon saying for "Uh-oh," beginning with THE JETSONS' Astro (1962) and continuing with Scooby-Doo in the Seventies.

Astro tended to speak a kind of English except that words with beginning consonants were replaced with an "R," and "R" was inserted in front of vowels.

Scooby-Doo was less fluent, but was given "Ruh-roh" as a kind of running gag when things were going bad.

Now "Ruh-roh" is sometimes used as a jocular trope where dogs are concerned, as in a recent news story about a dog who was accidentally released by Air Canada from his cage at the San Francisco airport. Rough meaning: "I goofed" or "I'm in trouble."
"Astro, if you don't stop that you're going to be in big trouble."

"Ruh-roh."

"Alright Astro, you asked for it, no outdoor privileges all weekend."

"Raw, Rorge!"
Ruh-roh by al-in-chgo October 11, 2013
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expression used in place of "uh oh"
derived from the popular cartoon show, Scooby Doo
Kelly: "That girl hooked up with Shaniqua's boyfriend, she's gonna get the shit kicked out of her during lunch today."

Amanda: "RUH-ROH."
ruh-roh by chiquitaLOCAA January 3, 2009
Ruh Roh was originally one of the many iconic Scooby-Doo sayings but has been turned into a phrase used at times of wrongdoing or mistake to make people laugh or lighten the mood.
Ruh Roh we're behind on our rent!

Ruh Roh I farted in the hand dryer

Ruh Roh The Po-Po
Ruh Roh by bored.exe August 29, 2022
Guy 1: OH SHIT MY HOUSE BURNED DOWN!
Guy 2: RUH ROH!ahhahaha
ruh roh by remright September 6, 2003
Scooby Doo's comedic mispronunciation of "Uh Oh", it is also a play on potentially dire situations, usually starting with a minor event that could escalate into something huge.
North Korea just shelled a South Korean island? Ruh Roh!

There is a small leak from the dam? Ruh Roh!
ruh roh by sanjuro_kurosawa November 26, 2010
Ruh roh by ym0onflow3r January 22, 2022
when you FUCKING NUT inside of your mom and forget that your dad is in the bed too
OH FUCK MOM I NUTTED IN YOU THERES CUM EVERYWHERE IT SMELLS LIKE FUCKING SHIT HELP RUH ROH
my mom: O SHIT CLEAN UP YOUR DAD'LL WAKE UP AND SEE THE STAINS
my dad: well why the fuck didnt you let me join in and bust a nut
ruh roh by zoinks scooby August 28, 2019