Yo mama is so ugly, she makes the Flash stop dead in his tracks.
Yo Mama So Ugly
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Explain Bear
Listen here, you uncultured swine. The joke is that yo mama's ugliness is so extreme that it can stop even the Flash, who is known for his super speed. Basically, she's uglier than your face, and you look like you were born in a dumpster. Get it now, dum-dum?