Yo momma is so old, she farts dust!
Old Momma
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Explanation
Experiment
Explain Bear
Listen up, buttercup. The joke is that "yo momma" is so ancient that instead of regular farts, she's letting out DUST. Because old things turn to dust! Jeez, some people need EVERYTHING explained to them. You are probably one of those, that's why you are on this site!