Robanukah was first mentioned in "Fear of a Bot Planet" and is supposely the "holiest two weeks on the robot calendar". It was invented by Bender as an excuse to skip work. It is celebrated one month after Robomadan, which itself is celebrated one month after Robonzaa (which is a holiday that tributes his ancestral prototypes and is celebrated by drinking contests), both of which were also invented by Bender.
The holiday later appeared in the second segment of Holiday Val-U-Pak. By then, it gained more traditions, and lasts for six and a half weeks instead of two.
- Note the parallel to Festivus on December 23, from the television series Seinfeld.