Yiddish version of "a needle in a haystack." SOURCE: Bernstein, Jüdische Sprichwörter und Redensarten. Variation: substitute "needle" (nodl|נאָדל) for "pin." (photo source)
מיר זוךן אַ שפּילקע אין אַ וואָגן היי.
Mir zukhn a shpilke in a vogn hey.
We're looking for a pin in a hay wagon.