An erudite pervert; one who, although quite educated, cannot escape their perversity.
After hearing of his Nobel prize nomination, Dr. Slovic immediately ran to the nearest restroom and rubbed one off; he continuously mumbled to himself, "I am such a dirty nerdy."
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.