Meaning of KY(KY)
KY means the person who can’t read the air. It’s an abbreviation of “Kuuki Yomenai (Hito)”(空気読めない人)
This word is starting to old, but some people still use this.
A: What do you think about Yamada?
B: I find he is smart but he is KY.
A: I agree, sometimes I want to say “Read the air!”.