also: ちんぶんかん
noun
gibberish; babble; gobbledygook
Refers to speech or writing that is incomprehensible, often used in the phrase ちんぷんかんぷん for emphasis.
彼の説明はちんぷんかんで、何を言っているのかさっぱりわからなかった。
His explanation was gibberish; I had no idea what he was talking about.
It's all technical jargon; it's complete gobbledygook to me.