Awesome/wow. Comes from twitch community of a frog meme people called pog. The frog with like a wow expression was named poggers on Twitch so people use the phrase to mean that face/emoji
Not quite the full history. Poggers was based on PogChamp. PogChamp was a Twitch emote, of Street Fighter player/content creator Gootecks from when he and Mike Ross did a silly video bit playing pogs by dropping a fight stick on it.
PogChamp was used a ton on Twitch (and other creators made their own versions of the face), until Gootecks kinda got problematic with his remarks on Jan 6th (and other stuff like alternative health and COVID disbelief). I think they replaced his face with a number of other reactions that also fit the bill?