Throwaway/ˈθrəʊəweɪ/ Definition 1 of 3Pro Tip 1/2Eco-awareness Understand the environmental implications of using throwaway products. Many cities are reducing throwaway plastic to protect the environment. Pro Tip 2/2Non-literal Be aware that 'throwaway' can be used metaphorically to describe attitudes. His throwaway approach to relationships makes him seem careless.