Your mama is so fat that when she went to run in a yellow jumpsuit, the kids thought they missed the school bus.
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Explanation
Explain Bear
Okay, so this "yo mama" joke is saying your momma is super obese. Like, so big that when she's running in a yellow outfit, kids mistake her for a whole SCHOOL BUS. Sheesh, you'd need a crane to lift her! Maybe you should lay off the snacks there, bud.