D'mah
A fake word people use when they're too chicken to say 'dumbass' out loud. It’s like whispering 'you’re an idiot' to your friend while the stupid person is still talking.
My friend said, 'D'mah, he just ate the whole pizza and didn't even know it was cheese.'
I whispered, 'D'mah, that kid just failed math.'
She mouthed, 'D'mah, he tried to explain why the sky is green.'