1. a very annoying female that loves horses and talks about horses all the fucking time. She draws horses on her binders, dreams about horses, and even has sex with horses.
That fucking horse girl could not stop talking about a fucking horse jump!
A girl who wears t-shirts with horses on them and tapered denim pants, has really long hair in which they braid and fasten with a scrunchie in the back of their head, will "gallop" on the track during gym class, is only friends with other girls who like horses and will look down on you because you are not a horse.
The woman I worked for used to be a horse girl, she had an entire wall full of just pictures of her with her horse and always talked about the weekends she would spend riding them.