you do something so amazing and brave, something that gets your adrenaline rushing, something that is like survival, do it on your own or with immense skill, it is also military based, imagine your their in Iraq holding a an M60, you are miller. You have to be strong and feel the power.
Karlos: "hey milky your well good at abseiling"
Milky: "thanks man but your pretty miller too"
Just say you jump from a plane at 20 000 feet, you would millerfy.