Ruh Roh was originally one of the many iconicScooby-Doo sayings but has been turned into a phrase used at times of wrongdoing or mistake to make people laugh or lighten the mood.
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!
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
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."
And dying in yo' bed many years from now, would ya be willing ta trade all da days from dis here day ta dat fo' one chance, just one chance, ta come back here as young men an' tell our enemies dat dey may take our lives but dey will never take our freedom ... YUB NUB!