Comes form the german Youtuber Maxim (Letsreadsmallbook) and means GG but in his own way.
Means also that something gone wrong but you can joke about it.
The "Word" is well known in the german LoL community.

Good game typed like a retard

Ge·ge
ˈgee-gee/
Name
Evryone should know about You
A very talented person.
"Fang: Woah who drew that?!
Vanille: Its Gege were talking about"
synonyms:
synonyms: breathtaking, awe-inspiring, magnificent, wonderful, amazing, stunning, staggering, imposing, stirring, impressive; More

2.
excellent.
exclamation: cool

used to express acceptance or agreement.

A german youtuber (Maxim Markow) using this expression in a lot of his videos. It's gege = gg for good game and ja = yes

to emphasize it.