Your mum is so stupid, she tried to take the crown off a "Keep Calm and Carry On" poster so that she could become the new queen of England.
Yo Mama Queen
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Explanation
Explain Bear
Listen up, dummy! The joke is saying yo mama so dumb that she think she can become queen by just taking the crown off a poster. Like, duh, that's not how it works! Also you probably think it works that way too.