Kashmir banay ga Pakistan(meaning: Kashmir will become Pakistan or Kashmir will become a part of Pakistan,Urdu: کشمیر بنے گا پاکستان) is a political slogan that is usually chanted by separatist and Pakistan supporting people factions in Indian held Kashmir. The slogan is also used by Pakistan politician in public gathering regarding Kashmir issue. Though it is unknown about the person who had created it but its usage has been in lime stone in the ongoing unrest in Kashmir after the killing of Burhan Wani. Some Kashmiri leader who support complete sovereignty from both India and Pakistani state have modified this; like Amanullah Khan said "kashmir banay ga Kudmukhtar" (Kashmir will become sovereign).
References
Kashmir banay ga Pakistan Wikipedia(Text) CC BY-SA