Your mom is so fat that she only knows three letters, which are "KFC."
Your Mom Only Knows KFC
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Explanation
Explain Bear
Alright, listen up, you goofball! The joke is that this person's mom is super fat, so fat that she only knows three letters: K, F, and C. Get it? Like the fast food chain? Because fat people like to eat? I can't believe I have to explain this to you. You probably eat paste.