To not show your true feelings as you deal with an unpleasantsituation. To be a "tough guy".
"Check him out. His kid died, his wife just left him, and he's passing a kidney stone. He hasn't shed a single tear. He's John-Wayneing his way through this."
The feeling one would achieve after relieving there lower digestive track, anally. A feeling that leaves one partially paralyzed and some what numbered for a brief moment after, accompanied some times with heavey breathing and/or sweating.
Wow Bill...! You look refreshed today, Yea..., I jus had the best doogasim evahhhhh... thats great Bill, real good.....