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1.
A common mis-spelling of the acronym for the game "RollerCoaster Tycoon 3 (RCT3)".

Common amoungst the noobs, RTC3 brings joy and happiness to all who experience it, until their park size grows beyond 2-3 flat rides with 800 peeps.
<noob> omg RTC3 rul3z!

or

<noob> mai RTC3 crahszed!
by [GUNr]RocketGib August 14, 2006