Origin of this term comes from a girl who cannot get her eyebrows right, and goes back and forth trying until both eyebrows are too thin or gone altogether.
Term also applies to other types of girl stuff, like haircuts, makeup, and even things she is doing outside her own stuff.
Rosey: Hold still, I can't get your neck right if you keep moving!
Jer: I have been holding still for an hour woman! Stop eyebrowing with the clippers and fix my damn hair!
Rosey: I'm not an eyebrower! You just won't hold still!!
The origin of the term is that thing a girl does when she's plucking her eyebrows where she switches back and forth trying to get things even, but accidentally takes too much off EVERY time until there is no eyebrow left.
Despite the origin, this term applies to haircuts, makeup, and even external things the girl does.
Jer: Your hair looks fine woman, stop eyebrowing!
Rosey: No wait, I'm almost done, my hair is uneven!
Jer: You are such an eyebrower!