Boomer

Noun / Slang

Boomer is used to refer to someone, often older, whose opinions or attitudes are seen as out of touch or old-fashioned. It’s frequently employed sarcastically to dismiss viewpoints considered behind the times.

Example: “That’s such a boomer thing to say.”
Means: “That opinion is outdated or old-fashioned.”

Example: “Don’t be a boomer, just try the new app.”
Means: “Don’t be resistant to change or stuck in old ways.”