The term "boomer" is slang that primarily refers to a member of the "Baby Boomer" generation, which includes people born between 1946 and 1964. This generation is named for the significant increase in birth rates following World War II. In contemporary usage, "boomer" can also be used more broadly to describe someone who is perceived as being out of touch with modern ideas or trends, particularly younger generations.
The word "boomer" is derived from the term "Baby Boom," which describes the rapid increase in birth rates in the United States and other parts of the world after World War II. The first known use of "boomer" in this context appeared in the early 1970s.