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Thanks for this. I heard it too, but thought for sure that I had imagined it.

The beauty of not being a NASA launch ;)

Second language speaker here, what does this sentence mean?

It is a humorous reference to an American sitcom from the 80's called 'Different Strokes'. A lighthearted way of expressing disagreement.

[edit: While I'm at it: the main character 'Arnold' would express disagreement with his brother 'Willis' by saying "What you talkin' 'bout Willis?" something like once per episode. This was a running joke for the sitcom.]