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A person that is utterly repulsive. Their personal qualities are comparable to that of a sewage tanks. They are filled with an overload of disgust and can be considered just a volume of waste to the rest of the surrounding world.
Jake cheated on his girlfriend, stole from his grandma, and stomped on a squirrel. He is a Sewie.

Sarah: "I caught Jake cheating on me again"

Sarah's friend: "Ew, you need to dump that Sewie."
by MARictionary January 19, 2015
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