Yo mama so ugly, when she was cutting onions, the onions cried instead of her.
Onions cry
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Explanation
Experiment
Explain Bear
Listen here, smarty pants. The joke is that yo mama so ugly she makes onions cry. Usually people cry when they cut onions because of the chemical irritants released. But in this joke, the onions cry because they're sad they have to be near yo mama. It's a roast, get it? You are probably as ugly as the author of this joke.