another form of i dunno
Tyler: Tiff...how do u get the computer to do this?
Tiff: I dinno...
A phrase one says when they 'don't know what they want to have for dinner, combining "I dunno" with the word "dinner"
Hey Marisa, what do you want do you want for dinner?
-"Ah, I dinno, I'm starving. How about an apple?"