A combination of the words okay and so. Can be used as a substitue for the word like.
1. Most commonly used in day-to-day conversation.
2. Can be used to move on from an awkward moment/silence.
Boy1: Hey, how did the concert go?
Boy2: Kayso, you won't beleive how amazing it was!
Girl: Oh my god, did you hear about Britney Spears' latest stunt?
Girl: She is sooo amazing.
Boy: Kayso, wanna grab a bite to eat?