Other forms: zoomers
A zoomer is someone who was born between 1997 and 2012, although date ranges vary. The formal term for the whole generation is Generation Z, but zoomer has become a popular shorthand for a person in this age group.
Using letters to name generations started with Generation X. The term was used as a placeholder, and it stuck. Before that, generations were named after major historical events or cultural shifts. People in the generation before Gen X were called the Baby Boomers, as they were born during the post-WWII "baby boom." The term zoomer is a linguistic mashup of boomer and the Z from Gen Z. It began being used online as a joke, and it stuck, maybe because it reflects a generation that grew up in a fast-paced, digital world.