I know a lot of women who use the term balls, even referring to self. Balls has progressed from
- being its original, sexist, males-only implication
- to being verboten language because of that males-only implication
- to being co-opted by the very females and like-minded males who don’t give a rat’s ass where the term came from or what morons made it up - it means courage in common parlance and gets used alongside dude, man and whatever other stupid words we have in our dumbass language that everybody seeks ways of proving bias and therefore extra-specialness for their group.