The geniuses that are the Wikipedia contributors have compiled an amazing list of made-up words from The Simpsons.
My current faves:
- Unpossible (a classic Ralph Wiggum line)
- Craptacular (been in my vocabulary for years, along with Snacktacular)
- Double-Bacon Geniusburger
- Embiggen
(via the ever-cromulent boing boing)