n. one who lingers in your general area for no other reason than to look over your shoulder to see what you're doing. Usually someone who wants to catch you doing something wrong to report it to a higher authority.
1) "I wanted to surf youtube at work but because the boss' pet was being a hoverbug, I couldn't"
2) Teenager on msn: Id totally link u those pics but my lil sis wont get out of the room.
Another teenager on msn: Sounds liek u have a hvrbg.