Any activity (or group of activities) specifically designed to bring men together and allow them to remasculate (return to normal testosterone levels).
Every man needs Manrichment, as extended contact with the opposite sex may leave one drained and in need of some time to "recharge" with fellow men. As such, it is a male-only event and females need not ask if they can attend.
The term "Manrichment" is derived from the word "Enrichment", a term used by females to describe activities in which they meet and bond over all things female.
Guy's Night Out, sporting events, shooting guns, rock concerts, camping and going to a restaurant to eat copious amounts of meat are all excellent examples of Manrichment.