Slapjack is a highly simplistic card game, generally played among children.

Gameplay is as follows: a 52-card deck is divided into face-down stacks as equally as possible between all players. One player removes the top card of his stack and places it face-up on the playing surface within reach of all players. The players take turns doing this in a clockwise manner until a Jack is placed on the pile. At this point, any and all players may attempt to slap the pile to obtain it; whoever covers the stack with his hand first takes the pile and adds it to the bottom of his stack. Gameplay continues with hands of this sort until one player has acquired all of the cards.

The game is related to Egyptian Ratscrew.