also: エーケーワイ · エーケイワイ
noun
clueless about the mood; unable to read the room
Slang acronym from あえて空気読まない (daring not to read the air). Describes someone who fails to pick up on the implicit mood or social cues in a situation.
See also: 空気を読む
彼は本当にＡＫＹだよね。
He's really clueless about the mood, isn't he?
あの場でそんな発言をするなんて、ＡＫＹすぎる。
Making a remark like that in that situation is just so tone-deaf.