Addictionary

Addictionary: (noun) A website where you can find (or submit) words that aren't in common usage, but which should be.

Example:

bozone: (noun) The substance surrounding stupid people that stops bright ideas from penetrating.

It works in two directions: (1) You can submit words and their definitions; or (2) you can go to the "There Oughta Be a Word" section, where people have left definitions for which there should be words, and you can submit words that fit that definitions (e.g., for "a person who takes an item off the shelf in a grocery store, then later decides they don't want it and places it on some random shelf elsewhere in the store," there are currently 16 suggestions, including "cereal offender," "vendor bender" and "shopdrifter" (the current favorite)).