informal if you use something like it's going out of fashion, you use large amounts of it very quickly.
Emma spends money like it's going out of fashion.
like it's going out of fashion
Very quickly and in great quantities. My husband took a baking course last week, and now he's making cupcakes like it's going out of fashion!After getting his Christmas bonus, Jim started spending money like it was going out of fashion.
like it’s going out of ˈfashion
(spoken) used to emphasize that somebody is doing something or using something a lot: She’s been spending money like it’s going out of fashion.