Top Definition
An extremely large does of Tylenol. When this does of Tylenol is consumed, it can cause the person who consumed it to start seeing things as a side-effect of short term brain damage. Take note that taking a larger dose of which Rainbow Tylenol imposes can lead to kidney damage. Morbid Rainbow Tylenol occurs when a dose of Tylenol taken is so large that it causes life-threatening effects.
Junkie 1: Man, I totally ran out of weed, man.
Junkie 2: That's fine, you can use Rainbow Tylenol as an alternative.
Junkie 1: Didn't Kathy die from Morbid Rainbow Tylenol?
Junkie 2: There's only a 78% death rate from Morbid Rainbow Tylenol...
by ArchaicScholar December 30, 2011

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