Something (most typically a song) that has been so over used that it is boring and painful to hear. No matter how brilliant you thought it was when you first heard it after the millionth time today on the same radio show it is now annoying.
Named after the Oasis song of the same name which, despite being brilliant in many ways, has been rejected by many fans as "a bit wonderwall" due to over playing on air.
Person 1: "Have you heard that new Blur song?"
Person 2: "Only a million times already today... I did like it but now it's abit Wonderwall"