Greeting, slang, used most commonly in South Africa (subsequently also the source of the term).

Also used as a question, in order to show emotion as well as to find out information about certain things.

Also spelt "whatkyn", "watkyn" or 'kyn".

a) What is it with you?
b) Where do you come up with that?

It is a greeting word in South Africa, it can also be said when you are shocked