What is the meaning of Kk?

ISO 639-1 language code for Kazakh.

Okay (indicates that no further explanation is necessary for a subject, or that the message was understood and will be acted upon without further confirmation).

Confirm (originally a GDS status code, now often used as shorthand).

abbreviation of kanker

abbreviation of kuukausi (“month”)

abbreviation of kirkonkylä (“village with a church”)

abbreviation of konekivääri (“machine gun”)

alternative form of kkk

abbreviation of caca (“poop”)

abbreviation of knullkompis (“fuck buddy”)

abbreviation of konkurs (“bankruptcy”)

to pass (by)

to cross, to traverse

to experience

to approach

Source: wiktionary.org