Top Definition
The study of the art of chill, including people who are chill, claim to be chill, and accuse other of being chill or not. Usually, not liscened Psychillogist can determine if the person is actually chill, or is just a tool.
Tyrell believed he had a strong background in Psychillogy, but, as it turned out, was just a common douche bag.
by boonedoggle1 June 17, 2011

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