Libmeister is a common nickname or instagram handle for people named libby, or lib. It has a variety of both social and online usages, it can also signify if someone is a jokester of sorts.
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.