To act in the manner of a warrior to achieve self greatness, regardless whether task is large or small; relying on the faculty of self to prevail in an otherwise risky or chaotic environment; to be fully committed to a high risk activity.
To run the shit. Runner of the shit.
I can't believe he kayaked over that waterfall, what a shitrunner! If you fly a helicopter to get home from the bar you are definitely a shitrunner. We need a shitrunner to operate this crazy thing.