An insult to use against anyone with a name or username starting with "Har" or "Harb". Usually used in a joking manner, but can cause embarrasment if said in public, due to "Balls" usually being related to testicles.
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.