Munich is the most expensive city in Germany and therefore it is hard to find cool places if you're on a budget. Barschwein (consists of the 2 words bar and pig) stands in the long tradition of a typical students hangout serving most likely the cheapest beer in town.
Very relaxed and so not Munich the atmosphere is very inviting for a fun night out. The crowd mainly consists of students or young professionals and everyone is here to enjoy themselves - and the cheap drinks.
You get a card at the entrance where the waiters mark your drinks and you pay as you leave the place - so don't lose this card!