Gobbledygook (noun)

Language or speech that is meaningless or difficult to understand, often used in a humorous or negative context.

Origin:

From the words "gobble" meaning to eat quickly and noisily and "gook" meaning a person or thing that is not important or intelligible, it was first used in the early 20th century.

Examples:

1. The legal document was full of gobbledygook.
2. The technical manual was written in gobbledygook.
3. The speaker's use of jargon and acronyms was gobbledygook to the audience.
4. The text was written in gobbledygook and it was impossible to understand the meaning.
5. He was known for his gobbledygook speeches, that no one could understand.