1+1 answer 2 said all the kids, but 1 kid said 5. Then I said your mom feels embarrassed because everyday you look into the mirror, you see how empty your brain is.
Empty Brain
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Explain Bear
Listen up, buttercup. This joke is all about a sick burn. Everyone says 1+1=2, but one dummy says 5. The joke teller roasts that kid, implying they're so dumb their mom is embarrassed and their brain is empty when they look in the mirror. In short, it's an insult based on the fact that you got your mom to read this joke to you.