n. A person who does not control his behavior accordingly in a confined environment. Someone who speaks too loudly, makes comments about people when they are within earshot, and/or eats offensively-smelling food in the office.
John was on the phone for half an hour yesterday, and spoke so loud that the whole office - even the boss - could hear him. And to make it worse, he was actually commenting on co-workers and the boss. If John is not a cubicle cunt, I don't know who is.