The term "fishy" is an adjective that describes something or someone that seems suspicious, questionable, or not entirely trustworthy. It can also refer to a situation or story that appears untrue or implausible. The origin of this phrase comes from the idea that if something smells like fish, it has gone bad and is no longer safe to eat. In other words, if something seems "fishy," there may be more to the story than meets the eye.