This game is played by two people, with a standard deck of fifty-two cards. The object of the game is to end up with all fifty-two cards.
One person is chosen to deal the entire deck between the two players, face down. Neither player is allowed to look at his cards. The player who did not deal starts the game by taking a card from the top of his pile and throwing it, face up, onto the table. The other player throws another one, on top of the first card, and so on, until one of the players end up throwing down a Jack.
When you see a Jack on the table, you try to slap your hand over it. The first person to slap it gets all the cards underneath, including the Jack. This process continues until one player holds all the cards, and is declared the winner of the game.