Ma'khaiya
A Ma'khaiya is a girl who's got a pretty face, a pretty brain, and a pretty mean mouth. She's got a mean resting face but is actually sweet. She'll help you, but don't mess with her or she'll cuss you out.
She said she'd help me, then cussed me for being late.
She told her brother to shut up, then cussed him for being loud.
She said she'd never leave me, then left me for someone else.