National Gibberish Day

National Gibberish Day is an unusual American holiday dedicated to the playful use of nonsensical or incomprehensible language. It is observed annually on September 20 in some U.S. states.

History

The exact origin of this holiday is unknown. In modern language, “gibberish” refers to speech that does not make sense to most people—either as random sounds or words lacking coherent meaning. The term can also refer to professional jargon that is not easily understood by outsiders.

National Gibberish Day is most often celebrated by people in certain professions or groups who use their own unique language.

Some researchers believe the word “gibberish” comes from Jabir ibn Hayyan, an 8th-century alchemist who wrote his research in a coded language that only close associates could understand. Samuel Johnson, author of The English Dictionary, suggested this as the origin of the word “gibberish.” Although many linguists later questioned this theory, no more convincing explanation has emerged.

How to Take Part

• If you work in a field with its own jargon, use it more often today—your unique language makes communication richer and more interesting.
• Congratulate colleagues who use specialized jargon on National Gibberish Day.
• Learn about the history and meaning of different types of professional jargon.

When is National Gibberish Day in 2025?

National Gibberish Day is observed on September 20 each year.

Observations