Pigeon

In the context of gambling, a pigeon is a player who does not know how to play a game properly. It is used to describe a new or unsophisticated gambler who plays in a non-optimal way. 

As an example, in the context of blackjack, a pigeon is a player who has no knowledge of basic strategy. As a result of this, they may play too aggressively and bust very often. Or, conversely, they may play too passively and lose to the dealer by having less points. Such a player will also, obviously, not understand more complicated concepts, such as card counting. 

In slots and video poker, a non-skilled player is much more likely to choose a machine based on its theme or brand, rather than its payout percentage (in video poker, this figure can be calculated using the machine’s payout table).

Pigeon:

• A player who does not know how to play a game properly.