Danger Zone
The term used to refer to the time when you crush unrequitedly upon your best friend. After you get over it, the two of you forever call that period of time the danger zone.
Example:
Person 1- I do hope you are not entering the danger zone again
Best friend- No, I’m over you
Person 1- I do hope you are not entering the danger zone again
Best friend- No, I’m over you