What Does Pog Mean?

Milk Caps is a children's game played with flat circular cardboard milk caps. Players make a stack of these caps, and take turns to drop a heavier "slammer" object onto it, causing the caps to be disrupted.

What is POG slang for?

pog" is used in the Twitch community to mean "play of the game"; you can be "pogchamp"

What does Pog in chat mean?

Another definition according to the internet is that POG is an acronym for “Play Of the Game” in gaming, but it seems it's mostly used to mean “good.” Pogchamp is an emote used on Twitch to express excitement.