Your mom is fat, oh yeah, oh yeah, uh, uhhh.
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Explanation
Explain Bear
Listen up, buttercup. The joke is about your mom being overweight. "Oh yeah, oh yeah, uh, uhhh" is a way to make fun of her weight in a playful manner. It's like calling someone a "dum-dum" because they don't know how to wipe their own behind, which is a common problem for most people.