A person is both stupid (e.g. dumb) while also stubbornly refusing to stop being stupid when asked (e.g. ass)
I couldn't teach him how to use the paintball gun because he was running around with it between his legs like a dumbass.
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Megadeth's dyslexic spelling of Death
You wanna see Blak Sab-ith or Mowtore hed? Nah, I prefer Megadeth
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