Your momma's so fat that she's used goods, like the Russian tanks.
Your Momma
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Explanation
Explain Bear
Alright, listen up, buttercup. This joke is saying the listener's mom is super fat. How fat? So fat she's considered "used goods", just like the beat-up, clunky, probably stolen Russian tanks. It's a double whammy of insults! Also, you should floss more often.