So, in my eyes, camping for me is when you get 3 or more kills in one spot.
or five or more in one area.
Of course if you're pinned you don't have to leave to avoid a label. i'm sure a life is more important.

Now, as for sniping.
One kill per spot in a row. no exceptions. Notice the word Spot. I define spot as an area no bigger than the sniper towers on outpost. an area would be any room.

anything anyone wants to add? put it here

This what i do:

If a lot of people are around me then i go to a safe place and kill them. As soon as the actions drops off i move. Camping for me is when you just stand or sit in one place for most of the match.

Nah, i think that if you stay in an area for more than 5-10 seconds, it's also considered camping