Ur mom so stupid that she thought that Seventeen has four ghost members.
Seventeen's Ghost Members
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Explanation
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Explain Bear
Alright, listen up, buttercup. This joke is saying your mom is so dumb, she thinks the K-pop group "Seventeen" has four invisible members, like they're Casper the Friendly Ghost's backup dancers or somethin'. You know, because ghosts are invisible and not real, just like your brain cells when you try to understand basic humor.