Your mum's so fat, she fell into the Grand Canyon and got stuck going down.
Yo Mama in the Grand Canyon
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Explanation
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Explain Bear
Listen up, buttercup. This joke is about yo mama being so obese that when she takes a tumble into the Grand Canyon, she gets wedged in there like a cork in a bottle. The Grand Canyon is like, super deep, so that's saying something about how much mass yo mama got. And you, my friend, probably have similar traits, considering you find this joke confusing.