“ok boomer” is a phrase that you should only call someone that is older than you. you could also be joking around with friends but if they are younger than you then you’re screwed.
john said that we had to stop the party so i said ‘ok boomer’
The term ok boomer comes from a foreign phrase "okay so?". Implying that you don't care as to what said "boomer" has implied. However this term cant be used for millennial's, gen x's and especially not gen zers! The term is for a target audience. Baby Boomers.