The domain of a man or men. This could include but not limited to a man cave, living room, strip club, bar, saloon, and/or workplace. Any place that a man feels safe and free from the scorn of a woman.
Deborah, please remove yourself from my manvironment... your making me uneasy. I can't concentrate on my videogames while you're talking.
Gina, it should be illegal that I have to share an office with you. All of your personal and emotional issues that you bring to work is slowly eroding the atmosphere of my manvironment.