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1.
The act of shitting, wherein the resultant pile radiates such a fowl odor that by the time it hits the bowl, paint begins to peel from the walls and all who enter the restroom after without proper radiation protection develop a host of illness and on occasion, mutation and/or death.
Heads up everybody i'm going Chernobyl up in this bitch!
by Northside Wookie March 11, 2011
 
2.
Its when the shit hits the fan, and things start heading for a nuclear meltdown.
Dude, all of Japan's nuclear reactors are suddenly going Chernobyl, wtf!
by MonkeyMadness2012 March 15, 2011