Plarfer means whatever you want it to mean. Plarfer was first spoken in 1887 by Samson Pibbles Bradley and is commonly used with handicapped people nowadays.
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.