Peak Boomer originally referred to the year 2020, when Baby Boomers were overtaken by Gen Xers in the population, meaning the Boomer Era was over. However, the term Peak Boomer has come to refer to annoying behaviors that Baby Boomers continue to display, such as holding everybody up in the grocery checkout to write a check. One would say "Hey, Peak Boomer, haven't you heard of a debit card or Venmo?"

Generally, people use this term in a derogatory manner, and it often relates to lack of technology skills that younger generations take for granted. For example, a Peak Boomer behavior might be asking you "how do I get to read that article you showed me a photo of? There's no link!" Clearly, the Baby Boomer doesn't know they are supposed to click on the photo. this is a "Peak Boomer" behavior.

Peak Boomer can be an adjective, a noun and even a verb or adverb.
" Last night we were eating out with a group and Jenny's older friends were so annoying. Everyone else used the app to send in their order before we even got there. The Peak Boomers held us up demanding to see a printed menu! "
by Linguista June 13, 2023
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Being extra fucking boomery, doing things like linking the imgur logo instead of a picture.
Kitty is hitting peak boomer.
by xxsaggyboomersixtyninerxx October 15, 2019
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