i Register
In some senses, split-tail is marked as offensive, slang, US. Watch for register when choosing this word.
noun
A California fish (Pogonichthys macrolepidotus) of the carp family.
The pintail duck.
A woman.
I have encountered officers who believe a woman got a better assignment or somehow "got over" because of her sex. It's a shock to their egos that some "split-tail"—yes, I've had that original thrown my way—could possibly be more talented.