The experience of feeling sure that one has already heard a "new" Foo Fighters song, stemming from the bland, generic, and repetitive nature of Dave Grohl's songwriting.
Guy #1: Hey, what do you think of this new Foo Fighters single?
Guy #2: New single? No, you're confused, that song came out in the 90s. And then again in '05 and again in '09. Dave Grohl loves rereleases.
Guy #1: You've got Déjà Foo, buddy.