Noun; refers to the day when a group of guys get together and forget about their problems and girls. Men only, no women. You are not allowed to text or interact with women during the time you are with your friends on man day. Rock band is a common game played on man day.

The day after Valentine's Day, To complete the day the man must drink an entire case of beer to himself, get into a fight, watch nothing but Rambo, Kung Fu, Rocky etc. Eat nothing but steak (unless it is an animal you hunted yourself)