You're so fat that you only know 3 letters: KFC.
KFC Abbreviation Insulting Joke About Weight
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Explanation
Explain Bear
Alright, listen up, butterball! You're so dense you probably think KFC is a secret government agency. The joke implies that you're so overweight that the only thing on your mind is fried chicken. And since KFC is a famous fast-food chain, the joke equates your limited vocabulary to your unhealthy obsession. Get it now, tubby?