The act of telling a person or a group something you think is not well known or profound, but is common knowledge. Stemming from the late 90's, this was derived from the know-it-all of your friend group or family that couldn't wait to share that Bob Saget was actually a dirty comic and not anything like his character on Full house. The issue is, we already knew this.
"Did you know that Bob Saget is actually a very dirty comic? It's so hard believe because he's such a nice guy in Full House"
"Susan, someone needs to call you out on your sagettry, everyone knows Bob Saget is a dirty comic."
"Wow that's crazy, did you know that tomatoes are actually a fruit?"
"Yeah, Tim. We know, we all know, we've known that since 3rd grade science class."
Fogey/fogy /fougi/ sl. (early 18C+, orig. Scot) old-fashioned, stuck-in-the mud.
Person with old fashioned ideas which he is unwilling to change: Come to the disco and stop being such an old fogey!
You think me an old fogeyand an old tory, his thoughtful voice said. I saw three generations since O’Connel’s time. I remember the famine. Do you know that the orange lodges agitated for repeal of the union twenty years before O’Connel did or before the prelates of your communion denounced him as a demagogue? You fenians forget some things. (James Joyce, Ulysses. Penguin Books,1992. p. 38)