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Refers to members of Generation Y, sometimes called "millennials," and is a play on the term "Boomer," which refers to members of the Baby Boomer generation. Yoomer is sometimes used as a pejorative against a person/people who constantly talk or post about how good the 90's and/or early 2000's were. An example can be making a post about how western cartoons today are not as good as 90's cartoons.
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