Your mum's so fat that when she goes to KFC, they run out of stock of chicken.
KFC Chicken Shortage
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Explanation
Explain Bear
Alright listen up, buttercup. This joke is about your mom being so fat, that KFC runs outta chicken when she shows up! Get it? Probably not, since you're posting 'your mom' jokes. Bet you still live in your mom's basement, huh?