I can't even think right meow, I'm so stumpid.
You are the stumpidest person I've ever met. Seriously though. So. Stumpid.
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It consists of the words dumb and stupid. It means that the person you are calling stumpid is being dumb and stupid.
Joey: What is Barack Obama’s first name?
Mrs. Kelly (teacher): YOU ARE BOUT STUMPID AS HELL!