My Back

Who starts these things? I first heard the phrase in the movie, Blind Side, when Sandra Bullock said, "I've got his back". So now, whether it's on television, in the written word or at the movies: I've got his back, he's got my back, we've got their backs, or they've got our backs. It's one of those things that needs to wear out in a hurry and do you know why? It reminds me of the first Gulf War when we all had to "hunker down", 24/7, yada, yada, yada.