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A guy/girl with an excessively large ass with a bountiful amount of cellulite. He/she is usually emotionally unstable and can be quite annoying.
You: Look at Sophia! Her ass is hanging so low from all that cellulite.
Friend: And to top it off, she's super annoying too!
You: She's definitely a Cartman Fatass!
by Psycho-kitty May 07, 2014
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