be more of a mutant

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Japanese, Chinese
Hi everyone.
I am reading the book of "Tell Me More".
The author told us a story that one of her daughters Georgia didn't flush the toilet, and their dog made the poop to the floor.
She raged about this and roared and blamed Georgia for the whole thing.
Her little daughter Claire was also scared by her rage.
So she said sorry to Claire.
Claire cried and told her that it was her who didn't flush the toilet.
Hearing this, the auther said, "Could I be more of a mutant?"

What does the sentence mean here? Is it a common use?
Thank you in advance!
  • lingobingo

    Senior Member
    English - England
    No, it’s not in common use. It’s a very unusual/weird remark – but presumably by mutant she just means something like idiot.
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