You're so fat, the only thing you could be for Halloween is the Kool-Aid Man.
Kool-Aid Man Halloween Costume
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Explanation
Experiment
Explain Bear
Listen up, butterball. This joke is about a fat person. The joke is that they are so fat, the only costume they could wear for Halloween is the Kool-Aid Man because the Kool-Aid man is very large. People dress up for Halloween. I bet you dress up as someone who eats less.