"How Do You Want To Do This?" is a catch phrase of Matt Mercer of Critical Role. Whenever a boss monster dies, Matt gives the player who landed the killing blow a chance to embellish the move and describe what they're doing. It is his way of making the game more epic. For an example, there is the video below. The first "HDYWTDI" moment is at 1:30. Lots of screaming and yelling by the way, which sounds awkward when you're not getting all the tension build up in the scenario itself.
Today though, I ask you this: Your facing an adult green dragon. Your party is beaten and haggard around you. With one turn left before the Dragon gets to go and finish you all off you manage to land the killing blow. So, how do you want to do this?