This catchphrase has no meaning. It is suppose to trigger a person when you say because they don't know what it means.
Man: yeo, you're dumb as fuck
Boy: Brush your brush
*man is triggered because he doesn't know what it means*
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Basically you eat out a hoe. It can be also used to tell a person to shut up because they're hungry.
Man: You know what?
Man 2: What?
Man: Eat a hoe!
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