Slang term. An acronym of "play of the game" a term coined by multiplayer games such as overwatch. In the context of the game, it shows a good "play" from the game round where a player exhibits great skill.
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In the "pog" form, the word can mean something that is good or something that exhibits positive energy. A person that achieves something notable can be a "pogchamp".
" Yo dude, I nutted right in her eye. That shit was pog!"