Stands for "soon-to-be"; often used on Reddit to describe someone.
My STB husband and I are excited to get married in a couple months.
STB Is Just A Guy Who Likes To Watch Animes And Make Telegram Bots
STB Is Norwegian slang and is a reference to "stabæk" which is an area in bærum commune.
Where are you from? Oh, I'm always STB!/ hvor er du fra? å, jeg er alltid STB!
Soon to be (Meant for a contact name/irl name) Means you’re rooting to date that person/ Talk to that person
“That girl over there is my STB.”