a dinni ken
A dinni ken is when you're so confused you might as well be speaking a different language.
'I dinni ken how to fix my phone.', said by a kid who dropped it in a puddle.
'I dinni ken why my dog is barking.', said by a kid who just let the dog out to pee.
'I dinni ken what the teacher said.', said by a kid who was texting during class.