Yo mama is so fat, the country of Russia isn't big enough to house her!
Yo Mama So Fat
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Explanation
Explain Bear
Listen up, genius. This "yo mama" joke is sayin' this person's momma is super fat. How fat? So fat that even a huge place like Russia can't hold her. It's an exaggeration to be funny. You probably think Russia is small, because your brain is small.