Nu-ştiu-ce literally translates to "I don't know what," but in this context, it functions as an idiomatic expression meaning "a certain something" or "that special something."
It's an interesting word choice because it captures the ineffable, almost magical quality of love that the singers describe. They sing, "Ne iubim şi-avem în noi acel nu-ştiu-ce" (We love each other and we have in us that certain something), highlighting a mysterious, undeniable connection that goes beyond words or logical explanation. This makes it a unique and memorable phrase.
This song by Romanian superstar Inna is all about a love that doesn't need a big reason or a complicated explanation. It just exists. She sings that she sees her happiness only in her lover's eyes: "Doar prin ochii tăi îmi văd fericirea" (Only through your eyes do I see my happiness). It's a feeling so deep that their connection makes the whole world feel bigger and they enjoy the simple things, like telling each other stories in whispers.
The chorus is the heart of the song, and it's beautifully simple. Why are they in love? "Pentru că, pentru că / N-avem un motiv anume, pur şi simplu e" (Because, because / We don't have a specific reason, it just is). They don't need to analyze it. They just know they have that special, unexplainable connection, what they call "acel nu-ştiu-ce" (that 'I-don't-know-what' or 'certain something'). It's a sweet celebration of a love that feels completely natural.