Yo mama is so ugly that even Donald Trump couldn't be inside her dreams.
Yo Mama Ugly Trump Dreams
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Explain Bear
Listen up, buttercup. This joke is a roast, meaning it's an insult disguised as humor. It's saying yo mama is so ugly that not even someone as self-absorbed and used to 'beauty' like Donald Trump would want to dream about her. Basically, she's uglier than anything that has ever existed and you are dumb.