I mostly use the term when talking about bands who basically forego everything (musical quality, own believes, etc) in order for cash. Nelly Furtado's an excellent example; she used to make 'pop' music, but at least it was slightly original. The trend of the past few years has been dance-like pop music with 'daring' lyrics almost directly about sex, while ballads have to be about a lost love. Nelly Furtado has completely changed her style to follow that trend, and it seems all too obvious that she's only doing so for the money.
And there's Greenday as well. If you make a whole album about the stupidity of mass consumerism and then set up a huge marketing plan to make sure that album is sold far and wide to as many customers as possible, you're just being a hypocritic *****.