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Definitions by bigallittlew

You don’t know jill about jack

You don’t know anything about anything, or jack shit. It means you’re so out of the loop, you don’t even know Jill, let alone Jack. Like are they siblings? Dating? What’s the situation? You don’t know. That’s how lost you are.
He was tryna act like he knew what went down last night… boy, you don’t know Jill about Jack.