to put kai is to put your 'hand'(kai) on a person after obtaining the required consent in order to commence with sexual activities. Followed by an '-uh' if asked as a yes/no question used as a rising intonation.
A: I finally met my gf for the first time after a year of texting online.
B: finally!!! Put kai-uh?
A: Yesssir ya boi finally a man.