it is a Japanese saying, and it really means "kuki yomenai." That is when there is a group of people and one person just is out there. She doesn't know what is going on, and she cant tell what the other people are trying to do.
person A: Isn't Mrs. Otter just so mean! She gave me a F.
group of people: Yeah she can be a bitch sometimes.
KY girl: I like her, shes nice.
group of people:...
person A: WOW you are sooo KY!!