Stands for "Good morning, gamers"
A greeting for in-game chats. Especially prevalent if the game is turn-based and continued into the next day.
"GMG, Jake is up"
A “Good Moral Gentleman” in dating. A man who has high moral value (ex. Respect, compassion, trustworthy, disciplined, courageous)
Greg is not just a high value man. He’s a catch! He’s a GMG.
Omg gmg is when something so exciting happen in the morning that you want to say omg ("Oh my god") and gmg ("good morning") at the same time for no particular reason since your hands are shaking.
Omg gmg I saw a giant racoon jump off the roof of my house.