Yo mama's so ugly, when she was little, she had to trick-or-treat by phone.
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Explanation
Explain Bear
Listen up, buttercup! This "yo mama" joke is all about how ugly your mama is. Like, so ugly, she can't even go trick-or-treating like a normal kid. She has to do it over the phone 'cause nobody wants to see her face. It's a classic insult, see? You probably look like her, you goblin.