Also known as an Hu. 1 Human Unit is the average amount of space taken by a single human, usually a 1 to 1.5 foot column around a person who is standing still. Many people like to take up several Hus, especially those who think they are exempt from the 'get the hell out of my personal space' rule.
Human units are used in places like movie theaters, where individuals are only given a certain amount of space, as well as in determining 'maximum occupancy' for any particular public place.
"This bed is made for 2 adults. If you don't want to sleep on the couch, you will learn to take up fewer human units."