Top Definition
The mental retardation version of the word "genius". In the movie, <I>Flowers For Algernon</i>, the main character, Charlie, expresses his yearning to become smart and to be a "geenass".
Boy Kim, when you said that stupid thing today, I thought, "Gee, Kimmy sure is a geenass."
by your mother. June 11, 2003

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