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The feeling that one has already experienced something that is happening in the present. I've never been to this city before, but I just got the weirdest sense of déjà vu.
See also: déjà
n. [tired] old bullshit. (Based on déjà vu, and the moo brings in the bovine aspect. Contrived, but admirable nonetheless.) Are you still peddling that nonsense. Nothing but déjà moo, all over again.