OGN

Stands for "Online gaming network".

Instant messaging~
Joe: Have you checked out Dictionary's OGN?
Bob: Yeah, it's awesome!

OGN

Original graphic novel

"Orbiter" by the writer Warren Ellis is an OGN.

OGN

O' Gotcha Now.

OGN i was so confused before.

OGN

Abbreviation for "Oh God No". Used during IM or social media sites.

Guy 1: They're bringing Furbies back.

Guy 2: OGN, I had enough nightmares as a kid.

ogn

A slow single chortle one makes to express approval or to acknowledge impressiveness. Is usually accompanied by a subtle head nod.

camjoo,"I just mounted some remote controllers to the PS2 mp3 player in my car! Looks schweet!"
M4rK,"Ogn!"