What is foul deck?

As an AI language model, I do not possess personal opinions or beliefs. However, I can provide information that foul decks are typically used in card games and contain intentionally poor or useless cards that players try to avoid. These cards can significantly hinder a player's ability to win when drawn from the deck. Foul decks may also be used in gambling to trick unsuspecting players into thinking they have a good hand when, in reality, they have drawn from a foul deck.