We have also gotten much use out of the term "slitherer-outer" (or is it "outerer"?).

Slitherer-outer. ("Of course you hate getting angry! . . . You don't like anything unpleasant, do you? You're a slitherer-outer, that's what you are! You slither away from anything you don't like!") It is a word in my family's household as well. It's very useful.