Top Definition
The belief that ones self is the smartest, most good looking, and only important person in existence. People with such belief must also refer to themselves in the third person, and refer to large groups of onlookers as the "Body"
"My professor is so full of himself... he even refers to himself in the third person. He must be a follower of Manciniism."
by MCs apprentice November 19, 2009
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