In certain card game

Card game

A card game is any game using playing cards as the primary device with which the game is played, be they traditional or game-specific. Countless card games exist, including families of related games...

s, table talk is communication by a player with another player with the cards in their hand, contrary to the rules of the game. Such communication may be through explicitly naming cards, but it is far more common to try to give hints which the opposing players will think innocent, but which will be understood by the player's partner.

Two Player Table Talk

In some games a player may modify the way they play in order to convey information about their hand to their partner. This is considered acceptable and is not termed table talk, even though the distinguishing line may be very fine. For instance, a 500

500 (card game)

500, Five Hundred, is a game devised in America shortly before 1900 and promoted by the United States Playing Card Company, who copyrighted and marketed the rules in 1904. The game can be played by two to six players but the most common form is for four players in partnerships although some sources...

 player might place a bid of six no trumps to indicate that he holds the joker; this would be acceptable. However, he might modify the tone of voice when making a bid to indicate to his partner that something about the bid is significant (the suit, or perhaps that he does not wish to win it).

Hearts

In the game of Hearts, it is generally unacceptable to talk about the location of the queen of spades or notifying other players of someone threatening to "shoot the moon". Whether this type of table talk is acceptable will depend on the game, the players and the stakes. It is likely to be at least considered unsporting in any but the most light-hearted, social or drunken games.

Pinochle

Pinochle is a card game with pre play meld bidding. Pre-arranged fake meld bids are a kind of sneaky table talk and considered definitely cheating.