KY
Acronym for "Ku-ki ga Yomenai" . in Japanese.

Literal meaning of the phrase is "He/She can not read the air".

Person who is KY doesn't know what is expected of him to-say or to-do in a situation, and often saying things that cast a chill over the whole room.
@Karaoke box:
Tetsu:Hey girls, have you already made requests for the songs to sing?

Naomi:Yeah, I put new song from Lady Gaga!!

Tetsu:Nice!!, how about you Yoko?

Yoko:I put "Wonder Wall" by Oasis and "Imagin" by Beatles and "America's natinal anthem" and...

Tetsu:Wow,, wait! did you know you have to sing all the songs consequtively?

Yoko:Yeah ovieously!

Tetsu:...But people take turns in Karaoke Yoko!

Yoko:Why? "first come first serve" applys here too isn't it?

Naomi:Tetsu, forget it, Yoko is so KY.

Yoko:I really don't understand what all the fuss you are making?

Yoko:OK OK OK!!! I'll cancel one song from my list, now its 3 songs, are you happy now?

Naomi,Tetsu:What ever.