"Festivus" is a fictional holiday that was created on the 1990s sitcom, "Seinfeld."

"Festivus" was portrayed on "Seinfeld" as an alternative to Christmas, Hanukkah and other holidays.

One of the Festivus traditions is "the airing of grievances."

It might've started as a fictional, humorous holiday, but "Festivus" has morphed into a cultural phenomenon since the idea first aired on the show"Seinfeld" back in 1997.

Festivus was first introduced to the world during an episode of the show called "The Strike," which was supposedly based on the family traditions of one of the sitcom's writers.

And somehow, the fake tradition lasted for the rest of the 1990s and has carried on well into the new millennium.

Here's what you need to know about Festivus − "a Festivus for the rest of us,"

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