何なにが何なにやら

expression

what's what; heads or tails

Used in negative contexts, almost always as 何が何やらわからない or similar, to express complete confusion or inability to make sense of something.

See also: 何が何だか

• 説せつ明めいが難むずかしくて、何なにが何なにやらわからなかった。

  The explanation was so difficult I couldn't make heads or tails of it.

• 初はじめての海かい外がい旅りょ行こうで、空くう港こうに着ついたときは何なにが何なにやらさっぱりだった。

  On my first trip abroad, when I arrived at the airport I had no idea what was what.