KK is currently going through this phase which I call 'The Forever" phase. When things don't go his way or when he's upset, he'll fold his arms across his chest, pout his lips and say something like, "I'm not going to talk to you, forever!" or "I don't like Papa, forever!"
It's acutally his way of showing his extreme displeasure verbally. I think he's getting to be more sensitive about his feelings and this is perhaps one way of expressing his emotions. Of course, he has no idea what he's talking about. His 'forever' usually don't last longer than 5 minutes on average. And much as we'll like to respect his feelings, the way he says it is sometimes so funny it makes us laugh instead.
