A person in a multiplayer game who will camp in a turret or gun-like form waiting for any enemy to arise, these players will not leave this form the entire game unless killed.
Usually these players will try to camp up high and far away from you as to snipe you from afar.
Watch out for that Blaster Camper over there, just go the other way and you will get him.
Blaster Campers are so annoying.