To bleat on and promote your Socialist point of view when you don't have any money, but the moment you become successful and wealthy to drop your ideals and sell out.
See Paul Weller now successful solo artist, once Social commetarist.
Not to be confused with 'Doing a Daltrey' and writing a song about hoping to die before you get old and not carrying that promise through.
Antonym of Billy Bragg
That John Prescott did a Weller the moment he joined Tony Blair's cabinet and ended up with Two Jags