You’ll be amazed how much googling I do when having conversations with friends - I wasn’t born in the West and things like movie references leave me confused af! But I hide it… thank goodness for urban dictionary
The other problem is people not capitalizing abbreviations as they should. You see even major news organizations doing it. The entire nation of Great Britain appears to think there's a space agency called "Nasa." Ignorant AF.
I think I read somewhere that there’s a rule for abbreviations that if they’re “pronounceable” you shouldn’t use all caps. For example, you write IBM because you articulate the letters, it’s not “Ibbem”. Conversely you don’t say the letters in Nasa, but you do in NSA and so forth.
OG refers to precedence due to age. It also tends to correlate with short names, but that's just because people like short names - and so short names are registered earlier and thus are older.