Lagom

"When the vikings took time off from burning and pillaging, they used to gather around the campfire to down a horn of mead. Though their thirst was great after all their exertions, it became a matter of honour for each warrior to ration his intake so that the horn didn´t run dry before everyone had a swig. In other words, one had to drink team-wise, or laget om, later shortened to lagom." - from Lagom