A form of friendliness that balances being polite and putting up boundaries. puts the individual in their place (the friendzone).
"Hey I don't like this guy but I don't want to be mean"
"Don't worry, just be friendly, but be friendzone friendly."
An abbreviated version of the word "interested." Used in a romantic context. Inbetween having a crush and liking someone.
"Do you still like him?"
"No not anymore I'm soooo not inst"
OR
"Isn't Spencer cute?"
"Yes I'm sooo inst."