A battle-axe is a derogatory term for an aggressive and domineering woman.
Perhaps the best example was Carrie Nation, who wielded a hatchet and made it her symbol. Not only was she a militant temperance activist, but she also became involved in the suffragette campaign for votes for women which cemented the stereotype.
So Momma and I were delighted when watching Doctor Who, and the Twelfth Doctor challenged a Viking to an axe battle. (Yes, yes, I know. We're a year behind.)
I knew I had to have one for myself! It took awhile, but then we spotted this beauty that sounded exactly like Peter Capaldi's description of the Twelfth Doctor's guitar:
"We ended up with a guitar that looked like a Fender Stratocaster that had been described to someone who had never seen one."
Oh, yeah. I be jammin'.
Anyone want to duel?