What does 'OOS' mean? Customer Services 30 September 2021 14:09 Updated "OOS" unfortunately means Out Of Stock. Related articles What is the Daily Stock Update (DSU)? What does 'Sold Thru' mean in the Daily Stock Update? What happens if an item is unavailable when I place an order, what do I tell my customer? Where do I find the discontinued product list? My order has not arrived, how can I check on it's whereabouts / track?