Aka Doc martens. Quite famous brand of boots and shoes. First made in the 60's for policemen and workmen. They come in a variety of colours and patterns including paisley and flowers. They're made too last and have designs for men and women. Air wair's are probably the most common style.
Bill: zoe just kicked me!
Ben: it can't have hurt that much
Bill: she was wearing her DM's
Ben: how are you still walking?!