Yo mama so fat, flat earthers say she's round.
Yo Mama and Flat Earthers
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Explanation
Experiment
Explain Bear
Listen here, dummy. The joke is about your momma being so fat that even flat earthers think she's round. Flat earthers, who are already pretty dumb, believe the Earth is flat. So, for them to think your momma is round, she's gotta be HUGE. And you, writing such a dumb joke, probably still believe in Santa.