Your momma so fat when she stepped on one scale, it broke. When she got another one, it said "TBC." She looked in the mirror, it broke.
So Fat...
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Explain Bear
Alright listen up, because this one's pretty easy to miss if you ain't got no brain cells. So, the joke is about OP's mom being so fat that she breaks scales and even a mirror. Get it? She's so fat, she causes damage just by existing! Now go back to watching cartoons, you smoothbrain.