Meaning
What does Pog mean?
Not to be mistaken for the fad of collecting plastic coins called Pog’s from the 90’s.
Pog is a variant of the original Twitch.tv emote called PogChamp. This version features a zoom-in to Ryan “Gootecks” Gutierrez’s face, showing only the mouth.
The emote on Twitch.tv is used to express excitement, shock or even surprise, usually spammed alongside with its original version to create more hype.
Pog is a variant emote based on the original PogChamp with several others like:
Origin
What's the origin of Pog?
The original image was taken from one of the streams featuring Ryan, called CounterCrossTV, by the message board 4chan’s sub board /v/ – Video Games which was later cropped, thus creating the unique emote Pog.
Pog was added to the FrankerFaceZ in 2017. which is a browser addon, that extends your viewing experience on Twitch.tv, by adding new unique emotes, chat features, etc.
Spread & Usage
How did Pog spread?
Pog is a daily driver in most live streams on Twitch.tv but used all over the internet as an emote or reaction image.
As of 10/12/2019. Pog is 8th on the top 100 most used emotes list according to the website StreamElements.

External resources
- Urban Dictionary – Pog