I have no idea what you're talking about - Like saying you're a genius when you're actually a fraud who

Like saying you're a genius when you're actually a fraud who just got lucky.

'I have no idea what you're talking about' said the guy who cheated on the test and got caught.

'I have no idea what you're talking about' said the girl who skipped the meeting and still got promoted.

'I have no idea what you're talking about' said the man who signed the contract and then disappeared.