Your mama is so ugly, when she went to the circus they thought she was Pennywise, Mom.
Yo Mama Is Ugly
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Explanation
Explain Bear
Listen up, buttercup. This "yo mama" joke is saying the person's mother is so hideous that a circus mistook her for Pennywise the clown. Pennywise is known for scaring children in the movie IT. So, being mistaken for him is a major insult.