You're so fat, when someone calls you fat, you get depressed and cut you a slice of cake.
Slice of Cake
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. This "joke" is saying that someone is super obese. So fat, in fact, that when they get sad about being called fat, they cope by eating more cake. It's like a vicious cycle of lard and lies, kinda like your last relationship.