A put-down used to tell an ignorant or closed-minded person of the baby-boomer generation that you do not respect their opinion because it's built on misinformation or ignorance so great that it's unreasonable to try and undo it all in the current conversation. Typically, one who uses this phrase does so because they realise that the person they're talking to would not be willing or able to enter a reasonable discussion about their misinformed opinion.
Boomer: "You millennials are so lazy, you think you're entitled to an easy life. You don't know how the world really works. By the time I was your age I'd paid off my mortgage because I worked hard."
Millennial: "OK boomer"
Millennial: "OK boomer"
by Pablo Guardo February 26, 2020
Get the OK Boomermug. by midgebtw December 2, 2020
Get the ok boomermug. by trinity lin December 21, 2019
Get the Ok boomermug. 
it is a slang used when some old person or someone from Gen X, or maybe even a Karen tell millennials what to do and what not to and Gen Z reply with "Okay boomer"
OLD GRANDPA: Stop looking at that damn phone. This is why you get sick all the time.
Gen Zs: Ok Boomer
Gen Zs: Ok Boomer
by Basic Bakughoe November 13, 2019
Get the Ok boomermug. When your parents never understand technology and tells you to stop using your devices. Often used by Millennials and Gen Z.
Boomer "YOU'LL NEVER BE SUCCESSFUL WHEN YOU ARE USING YOUR DEVICES AND NOT STUDY!!"
Gen Z "OK boomer"
Gen Z "OK boomer"
by HyperMan53 August 1, 2021
Get the OK boomermug. by Hi_bye8973 January 9, 2020
Get the Ok boomermug.