Usually a guys name who is rude to girls that are not popular or noticed and when he really likes someone but gets dumped by them crys to his friends and back bites her :)
Someone or something that bites your ankles.
To a postman, an ankle biter is often known as a dog.
To an adult, an ankle biter may be a toddler.
To hikers, an ankle biter is sometimes a tick.
And so on.