I recently saw that saying used in a youtube match-up where the speaker compared two marvel characters. In my opinion Batman as more fight (in this sense of the word) in him than Superman, Wonder Woman, Flash, Green Lantern, etc. In recent times Aquaman has come close.
But using Batman as a baseline, him being with him being 100, where would you put other DC or Marvel characters?
Wonder Woman: 90
(I'd have Captain America near here too.)
How about the Flash, Thor, Iron Man, Black Panther, Spiderman, Hawkeye, X-Men, Fantastic Four, JSA, rest of JL, etc.?
This isn't who would win in a fight, or who has the most fighting skill, just who has most "fight" in them.