OK, boomer
Interjection
Meaning
(Internet slang) Used to sardonically counter or dismiss an older person (typically a baby boomer) as lacking understanding of the circumstances, priorities, or culture of a younger generation, especially by a millennial or zoomer.
(Internet slang) Used to facetiously suggest that someone is old, boring, or out-of-touch.
OK, Boomer
Alternative form of OK, boomer
Examples
A University of Oklahoma professor is under fire for using the N-word in class, comparing it to the insult "OK, Boomer."
In addition to the label “boomer,” more recently came the expression “OK, Boomer.”
"Some critics insist it's ("OK, Boomer") an ageist slur".