Your mom is so fat she won't be in a coffin when she dies. She won't fit in it.
Yo Momma So Fat
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Explanation
Explain Bear
Listen up, numbskull! The joke is that someone's mom is so obese that a standard-sized coffin won't be able to contain her. This joke relies on the stereotype of fat people being gluttons. BTW, the only thing smaller than your brain is your attention span.