Bullshit is a shedding-type card game. The object is for the player to discard all the cards from their hand. This is done by placing one or more cards, ostensibly of a stated value, on the discard pile.

Others are allowed to challenge the veracity of the player's claim about the cards being played. The game has many nicknames, the most common including BS, Cheat, Bluff and I Doubt It, often used in situations where yelling 'bullshit!' may not be desirable, such as in games with children. The dealer deals each player an equal number of cards, or can deal the entire deck until it runs out.

If there are remainders or too few cards to finish a full revolution of players, those cards are placed face-down to start the discard pile. One or more Jokers can be used for added strategy or to deal all cards evenly; adding both Jokers brings the total to 54, evenly divisible among 3 players, while an extra Joker from a similar deck makes the deck evenly divisible by 5. The center of the table will hold a pile of face-down cards played during the game.

Play starts differently according to different rules. Some people start with the player to the dealer's left, while others start with whoever has the two of clubs, or the ace of clubs or spades, while yet others start with a joker (if used) or a special maker's card on some proprietary decks. On each turn, in most variants, the player must play the cards he has of a certain rank.

There are four common variants of the game.

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