Roger's Profanisaurus is a humorous book published in the United Kingdom by Dennis Publishing which is written in the style of a lexicon of profane words and expressions. The book is marketed as "the foulest-mouthed book ever to stalk the face of the earth". It is a spin-off publication from the popular British adult comic Viz, and features one of the comic's characters, the foul-mouthed Roger Mellie "the Man on the Telly who says 'Bollocks!". The title of the book is a word play on Roget's Thesaurus, Profanisaurus being a portmanteau of profanity and Thesaurus.