A young girl, usually between 10-14 and commonly 12 or 13, who dresses in revealing clothing. Prostitots are usually young girls who want to be seen as sexy and mature by the older men around them, and therefore end up wearing far too much makeup and dressing in what they think is sexy but simply looks skanky. They usually look like mini prostitutes, which is how the name came about. Prostitots may or may not be interested in sex; some are, and others are simply mistaken about what makes them look grown up and glamorous.
Can also be used as a random, nonsensical insult, though this usage is uncommon.
"Did you see those little girls in all that makeup and those high heels hanging out in the mall?"
"Yeah, they were total prostitots."