My sister said that I need to stop with the audited butt:
I got it from her when I was born.
Audited Butt
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Explanation
Experiment
Explain Bear
Listen up, genius. This joke is layering puns like a bear layers fat for winter. The word "audited" sounds like "autodidactic," which means self-taught. So, the person is saying they're self-taught in butt stuff. Then, the punchline is that they got their butt from their sister because... you know... genetics. It's not rocket science, but I can see why you didn't get it.