Noun, Na-adjective (keiyodoshi)
unintelligible language; incoherent language; talking nonsense; babble; gibberish; jargon; gobbledygook
Usually written using kana aloneOnomatopoeic or mimetic word
その理論は私にはちんぷんかんぷんだ。The theory is too abstract for me.
Also written 珍糞漢糞【ちんぷんかんぷん】