with the fairies
away with the fairies
Seeming eccentric, distracted, or a bit crazy. I can't follow what your mom is talking about—it's like she's away with the fairies all of a sudden.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
(away) with the fairiesgiving the impression of being mad, distracted, or in a dreamworld.
See also: fairy
Farlex Partner Idioms Dictionary © Farlex 2017