Purim Torah is a term used to describe humorous and satirical writings customarily read on the Jewish holiday of Purim. They can be simple or elaborate, and require no qualifications to write, other than a good sense of humour. With easy access to word processors and printers, making Purim Torah has never been easier.
Purim Torah authors, often displaying an amazing grasp of Jewish knowledge, playfully use some of the far-fetched methods of Talmudic logic and Biblical exegesis in order to reach absurd conclusions.
A Talmudic source for Purim Torah may be a passage in the “Bavli” (Hullin 139b) which serves as a model for subsequent “Purim-Torah”.
From Purim Torah on Wikipedia