An idea...

Sorry! Carry on…

Characters
Og, in Time Bandits
Og, in Mike, Lu & Og
Og, the leprechaun in the stage musical Finian's Rainbow and the subsequent film adaptation
Ogden "Og" Morrow, in Ready Player One
Original Girls, in the TV series Teen Mom OG

Music
O.G. Original Gangster, a 1991 album by Ice-T
"O.G. Original Gangster" (song), title track
"O.G.", a song by Snoop Doggy Dogg from Death Row: The Lost Sessions Vol. 1
Omnium Gatherum, or OG, a Finnish band

Other uses in arts, entertainment, and media
O.G. (film), a 2018 film
Og, the setting of the novel The Secret World of Og and its associated film

People
Og, an ancient Amorite king of Bashan

But most appropriately in the context of my compulsive pedantry, OLD GIT