"Nie wie, w jakie dudy grać"
"He/She doesn’t know on which bagpipe to play": About a person who doesn’t have an opinion; According to Kubik this negative variant of 2 proverbial phrases, used in speech, indicates "a lack of knowledge of the mechanisms of the effects (or impact) governing a described segment of reality"; NB: ➺ "Wie, w jaką dudę dąć".
Kubik, Józef: Przysłowia i wyrażenia przysłowiowe o instrumentach dętych (Proverbs and proverbial expressions about wind instruments). In: Polskie instrumenty ludowe… (1981), p.127 (»Krzyżanowski/Adalberg, I;502).
Słownik warszawski (1), I, p.579 (➺ Duda 2).