Dudu is a charming and affectionate term of endearment, similar to "sweetheart" or "darling" in English. It's not a common, everyday word, which makes it stand out.
In the song, Tarkan uses "Dudu dudu dilleri" (sweetheart's tongue/words) and "Dudu dudu gözleri" (sweetheart's eyes) to describe the captivating qualities of the person he's singing about. It evokes a sense of playful adoration and deep affection, making it a memorable and enticing word from the lyrics.
Tarkan's "Dudu" is a song brimming with the conflicting emotions of a painful separation and an undying love. The singer reveals that behind his smile, his heart is "shattered into ten thousand pieces." He carries the memory of his loved one everywhere, wishing she were by his side with every breath he takes. The lyrics paint a picture of someone trying to cope with immense heartache, bottling up his troubles while feeling that love shouldn't be a burden for the one who loves.
The song describes the object of his affection in glowing terms: she is "fresh as a flower," precious, and "pure as mother's milk," with eyes as deep as an "ocean." Despite this adoration, she is also fiercely independent and stubborn. She "knowingly defies love" and always "does as she pleases." The singer's heart makes excuses for her, tolerating whatever she does. The song ends on a hopeful note, suggesting that people make mistakes and that if they can just hold on to each other, perhaps the "sun can rise" again on their love.