The first and primary founder, usually of a startup company.
"Zuck is clearly Facebook's O.G.F."
"Larry and Sergey were both co-founders of Google but who was the O.G.F.? Can a company have two O.G.F.s?"
"Bill Gates is the O.G.F. of Microsoft"
"America had many founding fathers but I kinda feel like Franklin, Jefferson, and Washington were the three main O.G.F.s"