From Comedy Corner: 20 Words That Should Exist, for example:
4. BURGACIDE (burg' uh side) n.
When a hamburger can't take any more torture and hurls itself through he grill into the coals.
13. FRUST (frust) n.
The small line of debris that refuses to be swept onto the dust pan and keeps backing a person across the room until he finally decides to give up and sweep it under the rug.
16. PEPPIER (pehp ee ay') n.
The waiter at a fancy restaurant whose sole purpose seems to be walking around asking diners if they want ground pepper.
And 17 others: Link
Update 12/18/06: Neatorama reader Rick Yaeger suggested that these were plagiarized from Rich Hall's [wiki] Snigglets books (I haven't read them, so I had no idea if this is right or not).
If you're gonna quote, ya gotta cite.
It's just the place for ought-to-exist words!
This is the site of the guy who did the illustrations for the sniglet books. Burgacide is one of the entries there too.