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Pseudodictionary is an online dictionary for neologisms. It was founded in 2001. Site visitors submit an original word or phrase for inclusion, giving a description and an example. Unlike most collaborative dictionary websites, such as Urban Dictionary and Wiktionary, Pseudodictionary does not require the word already to have any current or common usage. The site accepts words that have been made up on the spot, including words defined with a humorous intent. Pseudodictionary has some content guidelines: no profanity, no toilet humour, and no racist, sexist, or offensive language. Submittals are reviewed and edited before being posted.
The site was mentioned by William Safire in columns he wrote for the New York Times on neologisms, in particular the etymology of muffin-top. Content from the site has been used in the Toronto Star newspaper feature on new words.