Oh Morti, I have a friend who ALWAYS says that when she's about to say something unpleasant about someone. Drives me mad!
Baz..perhaps it's meant as kind of irony? Like the phrase "Like I care?"
I also hate cliches that get used to death, like "Go on, make my day"
Hehe! Just thought...the same friend I mentioned above says something else that annoys me. When she's talking about someone getting cross about something she says "He went mad!" I always imagine the individual foaming at the mouth and being carted offf in a straight jacket!