Are you wearing a diaper? Because your butt looks so saggy.
Diaper Butt
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Explanation
Experiment
Explain Bear
Hey, listen up, dummy! The joke is about comparing someone's saggy butt to a diaper, suggesting it's droopy and full of... well, you get the idea. Diapers are for babies who can't control their bowels, and, well, your brain is like a baby's when it comes to understanding humor.