Inside Bets - A roulette bet placed on any number, or small combination of numbers.
Insurance - In blackjack, a side bet that the dealer has a natural. Insurance is offered only when the dealers up card is an ace. The insurance bet wins double if the dealer has a natural, but loses if the dealer does.
Irregular Playing Patterns - This generally refers to what is known as "bonus abuse". Online casinos that offer bonuses may require the player to play a certain number of spins/hands, or wager a certain amount of cash to qualify for the bonus. Irregular betting patterns are signs of players who aren't playing regularly (i.e. to win money) but are trying to meet those requirements with minimal risk of losing money in order to claim the bonuses.
IVT - Interactive Video Terminals
Jackpot - A big win on a slot machine.
Jacks or Better - In videopoker games the payout starts at a certain level ranking of hands. When playing Jacks or Better, if you get a pair of Jacks or a higher ranking, you win. You don't win anything on a pair of tens or lower.
Joker - The 53rd card in a deck, sometimes used as a wild card.
Juice - (USA) Vig. or Vigorish. Commission taken by the house .
Junket - Casino Junkets or Casino Complimentary Travel are trips offered to gambling customers, called VIP players, for travel to and play at a particular casino.
Kalooki - (also, Kalookie, Kaluki, kaloochi, Caloochi) Kalooki is a card game the same as Rummy, with a number of minor exceptions. Kalooki is a game often played with wild cards. There are many variants of Kalooki and the rules may differ depending on where the game is played or which version of Kalooki is being played.
Kicker - In a draw poker game, an odd high card held that doesn’t contribute to a straight or a flush, usually an ace or a king.
Ladderman – Casino employee who oversees the baccarat game. Personnel working this game are two dealers seated together at the center of the table, a caller standing at the table across from the dealers, and the ladderman, supervising the action from a chair above the table.
Laying the Odds - There are two fundamental forms of wagering, 'taking the odds' and 'laying the odds'. In most forms of sports betting, some odds are so high in favour of the likely winner that winning wagers get paid an amount less than the amount wagered by some percentage, and this is what is meant by 'laying the odds'. In most casino games the player is 'taking the odds' by wagering an amount that is less than they will receive if they win, that is if you wager $1 you would win more than $1.