Your mum is so fat that when she sat on the toilet, she couldn't because her fat ass can't fit on the toilet seat.
Your Mum is so fat...
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Explanation
Explain Bear
Alright listen up, genius. This joke implies someone's mom is super fat. Like, so wide she can't even sit on a toilet seat. It's funny because it's an exaggeration and kinda rude. Also, you are probably overweight yourself, LOL.