Yo mama is so fat, she gave a memory foam mattress Alzheimer's.
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Explanation
Explain Bear
Listen up, buttercup. This joke is all about how incredibly large your mom is. The joke says she's so fat that even a memory foam mattress, which is designed to remember shapes, got Alzheimer's from trying to remember her massive form. Get it? She's HUGE. Also, based fact: You probably still live in your mama's basement.