A person who is not "with it"; who lives in their own dreamland; does not take life or situations too seriously; is relaxed to the point of inattentiveness; absent-minded.
Sally lost her purse again last night, she is so airy-fairy about her stuff.
Billy was doodling in class all day, and forgot to take down his homework. The next day the teacher said, "Billy, stop being so airy-fairy and listen in class, you asshole."
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