Your mama is so ugly! It took your dad 15 years to return from getting milk.
Ugly Mama
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This "yo mama" joke is all about how ugly your mama is. Like, so ugly that it took your dad fifteen years to come back from the store after getting milk because he couldn't stand to look at her. It's an insult, get it? I bet you look like your mom, which means you're probably not a looker either!