Anyone know the term "autre" as meaning passé, untrendy out-of-date?

[pastilla]

My mother (British) used to use the French word "autre" (or something that sounded like it) to describe something that had gone out of style (passé) . . . always with a comical mock-affected, intonation . . ."Oh, my deeeeeeear . . . that is so "autre," don't you know?"

I tried to Google the word this morning to double-check the spelling, and came up with nothing. I'm starting to wonder if I misunderstood what she was saying?

Ring any bells with anyone?