1. Noun. A traditional Scandinavian competition dating back to the Middle Ages used as to measure a man's masculinity. The competition involves two men entering an oak sauna and, without the aid of refreshments, seeing how long they can bear the relentless, oaky heat. The last man left remaining in the sauna is declared the winner and true man, i.e. the possessor of masculinity, whilst the other is banished into the cold woodlands to fend for his survival.
Henry: Yo Ash, remember when I beat you in the sauna-off?
Ash: Yeah, my masculinity took a terrible beating that day.