Yo mama so fat,
Donald Trump himself tried to use her as his border wall in 2016.
Yo Mama Border Wall
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Explanation
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Explain Bear
Listen up, buttercup. This joke is all about how HUGE yo mama is. Like, so big that even Donald Trump thought she could be a substitute for the border wall he wanted to build. Get it? It's funny 'cause it's an exaggeration, and probably because you are overweight.