Yo mama so fat that her belt size is the Equator.
Yo Mama's Belt
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke is saying yo mama is so obese that the belt she uses to hold up her pants is as big as the circumference of the Earth. The Equator is the imaginary line that circles our planet, and it's pretty darn long, about 24,901 miles. So basically, yo mama needs a whole planet's worth of belt. Sad!