b. Somebody who overcomes a tough situation.
Person 1: He's been in the hospital fighting cancer for a year now.
Person 2: What a trooper.
2) An individual who, despite chronic marijuana usage, manages to maintain a high (no pun intended) level of achievement.
Guy 2: Yeah, I've got way too much to do, I'm out too.
Guy 3: I'm not skipping, it's fucking pottery.
(After Guy 3 leaves) Guy 1: He's a trooper.
2) Guy 1: So what'd you do after those blunts on Thursday?
Guy 2: Eh, I went to class, cleaned the house, did some homework, and got my taxes done.
Guy 1: Damn, you're a trooper.