throwaway
noun
Definitions
Something temporary and disposable.
adjective
Definitions
Disposable; intended for a single use prior to being discarded.
Example: As the film opens, a martial-drum-dominated version of the "Star Wars" theme and the inevitable bottom-to-top print crawl inform us that the Clone Wars, a conflict that originated as a throwaway line in the original 1977 film... http//www.nysun.com/arts/star-wars-clone-wars-painted-in-the-stars/83922/
Extemporaneous; off the cuff.
Example: The host made a throwaway remark about the president that was later repeated on the television news.
Selected or used without care or attention.