Mao

Mao is a card game. The first rule of Mao is "You can't discuss the rules of Mao." It is up to players to figure them out.

Some people consider it proper to tell new players that the object of the game is to get rid of all cards; others feel it is okay to tell them the general idea of how to play cards.

http://www.pagat.com/eights/mao.html