It's an British expletive, although the more common way of phrasing it would be "bloody bow." It says that she (Professor Umbridge) is readily recognizable, right there in the locket wearing her huge damn/flipping/sodding bow (and all the rest of her chracteristically idiosyncratic grab).

It's an British expletive, although the more common way of phrasing it would be "bloody bow." It says that she (Professor Umbridge) is readily recognizable, right there in the locket wearing her huge damn/flipping/sodding bow (and all the rest of her characteristically idiosyncratic grab).