What is Sean Oniell?
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An alien lifeform, or one who studies the extraterrestrial beings. Sean Oniell can be considered to be an expert because of his first hand experience with UFO's. Don't be confused with the common sex move the SHAWN ONEIL in which two gay lovers put sand in each other's buttcracks and try to scoop it out.
Man, he looks like a sean oniell, because of his huge head!
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A legendary phrase, or a random put down, or when someone picks holes in what you are saying and points that you are wrong out to everyo..