If you know that you don’t know, it’s very humble. Then you can learn more.
If you know that you know, that’s smart. Or a brag.
If you don’t know that you know, that’s ironic. It’s one of time-wasters.
If you don’t know that you don’t know, that’s very dangerous. And pathetic indeed.
A Bunch of Nonsense 
How if u dun know and u dun Wanna know??,what does that mean?
It could be either really stupid, or skeptic. Or perhaps u have a different interpretation? ;)