What is the origin of the English slang word Okeydoke?

This term comes from a businessman named Orrin Kendall (abbreviated OK) who made biscuits during the Civil War more than 100 years ago. His products wholesaled grain for the army and were extremely popular. The two letters OK are printed as a trademark.

Jackson, the seventh president of the United States, served as a court clerk in his early years. After each record was reviewed and found to be correct, he would approve it with the word OK, which means Oll Korrect (All Correct). Later, when Jackson ran for president, some people on the other side used this legend to slander him, calling him an uneducated person who wrote in other words.

The word Okay was invented by a political group in the 19th century. There is a man named Martin Van Buren who is preparing to run for president. His supporters set up a club to promote him. The name of the club is "Okay Club". It is said that the letters O and K are taken from Van Buren's hometown. Old Kinderhook, New York, where he was born.

Extended information:

OK is an informal colloquial word. Meaning: OK, acceptable. It can also express approval or agreement. OK can also be written as okay or O.K., with the same pronunciation. It is also the most well-known English word in the world.

When Americans express approval or approval for something, they often say ok, which means "good", "ok", and "not bad". This term was originally used by American railroad switch workers.

When they are on duty, if everything is normal on the railway, they say "all correct", which means "completely normal". Since the sound of "All" is close to "O" and the sound of "correct" is close to "K", for convenience, the workers omit "OK" to express the same meaning. Later, the meaning of the word continued to evolve, and now it not only means "good", "ok", and "not bad", but also includes the meaning of agreeing and acknowledging other people's opinions. Also used in signatures to express agreement and approval.

Reference material: OK_Baidu Encyclopedia