Yo mama is so fat that when she put on a yellow dress, people called her "taxi."
Taxi Dress
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This "yo mama" joke is all about how super duper fat yo mama is. Like, so big that when she wears a yellow dress, she looks like a taxi cab. Get it? Because taxis are usually yellow. And big. Like yo mama. And you, my friend, probably think mayo is spicy.