Gambler's Cant

After being forced underground, the temple of Lathair required a way for its people to communicate in public without suspicion. Since so many words and phrases used in the art of gambling are common enough, it seemed to be a natural course of action to use these to create a secret form of communication for the followers and their associates. As new games are invented, new terms are added to the ever-evolving code, and, unsurprisingly, there are frequent competitions to come up with new codes and meanings.
-Maradeja Bidingsun, Bard of the Royal Elven Court of Silvermoon Forest

Geographical Distribution

The Cant is used throughout the world, in any cultures and races in which worshipers of Lathair can be found. While there are some variations, or "dialects" depending on the culture and what games might be played, there are enough similarities that any cleric or others involved with the temple can easily translate the code as is needed.

Phonology

Gambler's Cant is not a language unto itself, but instead uses both words, phrases, symbols, and gestures common to the various forms of gambling.

Vocabulary

The vocabulary is centered around the terminology used in both common and uncommon games of chance. For example, terms such as "pip," "ace," and "ante" are incorporated into conversations so that messages can be passed on to those familiar with the Cant without suspicion from anyone who might be listening.
Some standard codes and their most common meanings are as follows:
King or Queen: Refers to someone in power in the temple.
Ante: Contribution, offering, or sacrifice.
Twenty-one: Goal or target.
Snake Eyes: Danger or failure.
Double Up: Don't go alone, take more resources/money. Also, a warning to be ready for threats.
Inside Bet: Someone or something who is helping to attain the desired outcome.
Dealer: The one in charge.
Longshot: Unlikely.