When someone pays a lot of attention to their boyfriend/girlfriend, cares for them, is kinda clingy towards them, and just in general loves them a lot.
When someone stalks another persons online status waiting for the greendot to appear and then forces interaction much to the dismay of the other person.
Nathan: I saw her green dot and IM’d her again. It was 2 am but she was clearly up.
Joyce: stop green dotting people when they wake up to pee, freak!