This could well be my new favourite Tumblr: The Oxford English Fictionary.

The Fictionary is dedicated to “Defining words that aren’t real. Yet.” It accepts user submissions as follows:

The OEF exists to define words that do not exist. If you have a word that needs a definition, submit it. If you have a word that already has a definition, that’s very nice, but go contact Merriam Webster instead.

A couple of my favourite recent words are:

Anachronister (noun): a time-traveling spider. (word submitted by anonymous)

Shquibble (verb): to verbally argue with someone, with both sides in full anger, in complete silence after having been shushed by a librarian. (word submitted by Chris)