Zehnaseeb [Also spelled as Zahenaseeb, Zahanaseeb, Zehenaseeb or Zeh-naseeb] is an Urdu word based on the root word 'naseeb' (which means luck or fate) and means one who has a good luck, someone lucky, or blessed.
Zehnaseeb is a song from the Hindi film 'Hasee to Phasee' starring Parineeti Chopra and Siddharth Malhotra, composed by Vishal-Shekhar, sung by Shekhar and Chinmayi, and written by Amitabh Bhattacharya. In the song, a beloved is addressed as 'zehnaseeb' which would mean 'my good luck', as in saying that your beloved is your good luck.
The Translation for Full Song can be found HERE.