Republicans should, I dunno, get behind a law that supports that, doncha think?
When I asked him, he just smiled, said, "I dunno Marty, I just knew."
I dunno, Mars'r; how kin I go down de riber when I done lose my boat?
I dunno as wimmin horse doctors is very common, but I dunno why not.
He saw the visions of two weeks burst like bubbles, and he whimpered: "I dunno."
I get a horse with somethin' the matter of his foot, and I dunno what.
I dunno yet, but I'll be a bed all right, an' I'll have Deacon with me.
I dunno, but he handed Lew a five-dollar bill to pay for the message.
dunno, that theah's sure hard-scrabble ground; we never did make us a good crop on it.
If you stop her off there, I dunno but she'd jine a circus or take to drink!
colloquial for "(I) don't know," first attested 1842 in American English.
Don't know •Casual pronunciation of don't know: dunno where he is (1840s+)