Conversation with Nate...

Nate:  Mom.  Can I have a snack?

Me:  Maybe.  Did you eat all your lunch?

Nate:  Just say "yes" Mom.  Just say "yes".  Don't say "maybe"

Me:  But I'm not going to give you a treat if you didn't finish your lunch!

Nate:  I know, but just say "yes".  "Maybe" means no, so don't say "maybe".  Just say "yes".

Me:  "Maybe" means "no"?

Nate:  Yeah.  "Maybe" means "no" and "probabwee" means "yes".  "I don't know" means "yes" too, so you could say that too.