The word "bummer" is a slang term commonly used to describe a situation that is disappointing or unfortunate. It can refer to anything from a minor letdown, like missing out on an event, to more significant disappointments, such as not getting a job you wanted. It often conveys a sense of sympathy for someone's misfortune or expresses frustration about an unexpected negative experience.
The term "bummer" originated in the United States in the early 20th century. It was initially used in a derogatory sense to refer to a vagrant or a beggar, derived from the German word "bummler," meaning "loafer" or "idler." Over time, it evolved to express the feeling of disappointment rather than its original meaning.