Old School Gamer (or Old Skool Gamer)
a Person who prefers old Games instead of new games
basically another word for retrogamer that was originated in a Dirty South Killa Song where he mentioned many Sega and Nes Games.
MAN1:"what are you playing"
MAN2:"super mario bros"
MAN1:"oh an OSG classic"
MAN2:"I am OSG so I love these kinds of games"