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3.
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."
by chiquitaLOCAA January 03, 2009
 
1.
Comedy replacement for "uh oh", Scooby Doo style.
Guy 1: OH SHIT MY HOUSE BURNED DOWN!
Guy 2: RUH ROH!ahhahaha
by remright September 06, 2003
 
2.
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!
by sanjuro_kurosawa November 23, 2010
 
4.
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!"
by al-in-chgo October 11, 2013