When you pack a vehicle, with its windows shut, full of nude dudes and crank the heat until the vehicle reaches a sauna-like atmosphere.
Hey guys, we've been drinking for a few hours. What do you say we go out into the parking lot for a man sauna to sweat out some of this alcohol.
Any confined space so packed with man that its temperature reaches sauna level.
There's so many men in my man cave that it's turned into a man sauna