Gruntwilligar T. Honkenoffski, patron saint of alt.acme.exploding.newsgroup, knows all and sees all.He has a website that is badly out of date, but his spirit lives on in the aforementioned newsgroup.
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.