Your mamma so fat Thanos had to clap 4 times.
Thanos Clap
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Explanation
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Explain Bear
Okay, so basically, the joke is saying that "your mamma" is super fat. Like, so fat that even Thanos, who can snap his fingers and wipe out half the universe, needs to clap four times just to make a sound. It's a roast, see? And you, my friend, probably can't even snap once with those stubby fingers of yours.