Acronyms dictionary OOS What does OOS mean? OOS is an acronym most commonly meaning out of stock. In some cases it can also be out of service. Examples of OOS 17 Start Collecting kits, two of which are OOS online. Hmm would really like to see some SC boxes for the lesser seen factions. @NiallJC1984, January, 2018 Bts shop is as bad as interpark smh. Why cant the cart auto delete oos items. It took me forever to delete 1 thing and i ended up not getting anything???? @nominomify, December, 2017 Consequently, OOS results in a loss of sales for both the beverage brand and the retailer - according to Harvard Business Review, over 40% of customers will go to a different retailer in order to buy their preferred product. Nancy Chen, Repsly, August, 2015 SEE MORE EXAMPLES Just Added bystander effect, CSI effect, Streisand effect, L + ratio, docufiction Note This is not meant to be a formal definition of OOS like most terms we define on Dictionary.com, but is rather an informal word summary that hopefully touches upon the key aspects of the meaning and usage of OOS that will help our users expand their word mastery.