Word Fugitives

I learned the term "word fugitive" a couple of years ago when I was bored at a Barnes & Noble. Essentially, it describes a thing, situation, feeling, or whatever that isn't appropriately named. For example, there's no widely accepted term for a kid that is being babysat.

William Shakespeare owned this particular arena. Bryson's Shakespeare includes only a brief catalog of the words that Shakespeare himself invented. Many of these are now a part of the generally accepted English language. In Shakespeare's time, many of his plays were difficult to understand simply because of the new words he employed. In this way, I suppose you could say Shakespeare was a lot like Emmitt Smith.

Anyway, you know that frozen black crap that always hangs behind your wheel well after you drive in the snow? You kick it off and it makes your shoe all nasty? What is that called?