mantuary
man·tu·ary
mantuary · mantuaries
A part of a home specifically reserved for adult male activities, such as drinking…A part of a home specifically reserved for adult male activities, such as drinking beer, playing games and watching TV; often a garage or den.
UK/ˈmæntjʊəɹi/US/ˈmænt͡ʃuˌɛɹi/