The only letters in the alphabet that you know are "KFC."
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Explanation
Explain Bear
Listen up, buttercup. This joke implies you're so fat, you only know the letters "KFC", you know, like the fried chicken place? This is because you are a fatass. Also, you probably don't know this, but the alphabet has 26 letters. Just thought you should know, since your IQ is probably the same as your weight.