- don't know: Who did it? I dunno!
Origin of dunno
Examples from the Web for dunno
Contemporary Examples of dunno
Historical Examples of dunno
I dunno as wimmin horse doctors is very common, but I dunno why not.
I get a horse with somethin' the matter of his foot, and I dunno what.
I dunno how you're goin' to git along with men-folks, if ye offer 'em the whip-hand.Tiverton Tales
"Why, I dunno's there's anything in the way of it," she said, soberly.
I've studied a good deal over her, an' I dunno's I've quite got to the bottom of her yit.
- (I) do not know
colloquial for "(I) don't know," first attested 1842 in American English.