Top Definition
Acronym standing for, Realities Are Setting In. Often used as a response after hearing something depressing and or upsetting to express displeasure.
Chris: I went to the doctors today, I found out I have to get my arm amputated cuz I've been shooting too much heroin : /

Dan: Damn... RASI...

Chris: ...Yea...RASI...
by C-Joint October 30, 2010

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