expression
I don't care; how should I know?; who cares?
A blunt, dismissive phrase used to show indifference or annoyance. Often said with a falling intonation. Can sound rude or confrontational; not used in polite contexts.
「明日の天気は？」「知るか！」
"What's the weather tomorrow?" "How should I know!"
そんなこと、知るかよ。
Like I care about that.