Explain the meaning of Shayr (Urdu Poetry)

Arts & Culture Poetry ( Intikhaab & Sho'ra-e-Gupshup)
1

Post any shayr and ask the meaning or explanation.

I will begin with a famous shayr:

Aah Ko Chahiye Ek Umr Asar Hone Tak
Kaun Jeeta Hai Teri Zulf Ke Sar Hone Tak

Please explain.