faddish
It's the thing everyone wants right now, but no one will want it when it's over.
My sister got a membership to that new gym. Now she's at the club every day. I bet she'll quit next week.
My brother bought that weird slime stuff. He's been playing with it all day. I think he'll throw it out tomorrow.
My mom got a fanny pack. She wears it everywhere. I bet she'll take it off in a week.