It's the video game culture applied to chess.
POG Championships

Before the spread of the internet and gaming culture, “pog” was a small, circular piece of cardboard commonly used to play a game by children and young adults in the 1990s. Now, “POG” is often used in gaming to mean “play of the game.”
In the gaming channel Twitch, “POG” is also an abbreviation of “poggers” which means “cool,” “amazing,”.
“POG” can also be used with “champ” to make “POGChamp.” This is sort of an abbreviation for “play of game champion.” This means that the player performed extremely well in a match and will be the best player in the game and get the “play of the game.”
It is commonly used in online games like Overwatch and League of Legends and on streaming services like Twitch and YouTube.
+1
Please, what is a Pog? And how does one become a Pog? And what makes a player a Pog Champion?
Thanks
Warchessky