The term “OG” can have different meanings depending on the context. The most common full form is “Original Gangster,” which originally referred to someone who has been around since the early days of a particular scene or culture, often associated with hip-hop and street culture. It can also imply respect or authenticity.
In other contexts, “OG” might simply mean “original” or refer to something that is considered classic or foundational.
If you have a specific context in mind, please let me know!