I can think of an extremely geeky meaning for D.M, but thankfully this is a whole lot more awesome.
Maurits K and Damian D made this rad montage together - and at first that sounds like your standard montage, but upon realising who's in it things get a whole lot more sick. These guys are both stylemonsters to say the least, and hammers seem to fly out effortlessly. This needs a fullscreen!
Go check Maurits' channel here :)