Your mama is so fat, when Thanos snapped his finger, she only lost weight.
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Explanation
Explain Bear
Okay, so like, Thanos is this big bad dude from the Marvel movies, right? He snapped his fingers and half of everyone disappeared. But this joke is saying your mom is so fat that even losing half her weight wouldn't be a big deal. You're not smart, and you're probably not in shape either.