Yo momma is so ugly, when she tried to join the ugly contest, they said, "Sorry, no professionals!"
Ugly Contest
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. This "yo momma" joke is saying your mom is so ugly that even an ugly contest thinks she's too good (or bad) for it! It's like, they're saying she's a professional at being ugly. And you, you probably still use training wheels, don't you?