In reference to a human, non-unicorn, who possesses very long flowing hair. It is usually wavy or curly and moves around when walking, like a horse prancing. Most commonly found on Renaissance fair enthusiasts, and a gentleman on my block that wears velvet blazers daily. Or shorter versions maybe found on business gents, who keep it flowy, but just up front.
Did you catch a sight of the way that guy was prancing around with his unicorn hair?
Her hair was so majestically flowing it looked as though she stole it from a unicorn, wait, it is unicorn hair.
It looks as though he has tamed his flowing locks for business unicorn hair, but the prance is still there.