When you get high with a bunch of people who don't speak your language.
Rick: Dude, all those guys from China were hella chill.
Dale: Yeah man, you got so Rosetta Stoned.
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When someone not ordinarily prone to party, live it up, or be out of control does just that.
Man, Michael Phelps got cold busted getting Rosetta Stoned.
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The state of being so high that you begin speaking another language.
Friend 1: Yo, did you know that Marcel speaks Mandarin?
Friend 2: Yeah, but he only knows it when he's high as a kite, man. He was straight up Rosetta stoned last night.
When someone is so stoned that they start speaking another language.
Guy 1: Hey man, what's up?
Guy 2: Je suis un buffle!
Guy 1: What are you, Rosetta Stoned?
Guy 2: Si senor.
A pretty good software that will make the green owl very very angry if you use.
Green owl: It's time to do your Spanish lessons!
You: No thanks I'm using Rosetta Stone.
Green owl: Don't fall asleep