Yo mama so ugly people dress up as her on Halloween.
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Explanation
Explain Bear
Listen up, buttercup. This joke is saying that yo mama is so ugly that people dress up like her for Halloween. Halloween is when people dress up as scary or funny things. The joke is funny because it implies that yo mama is scarier than a monster. Which is sad. I bet you dress up as a smart person, but we know that ain't true, bud.