Dice that has landed on a checker, off the board, or in any manner other than flat on the right half of the board. The roll is disqualified and both dice must be re-thrown.
An illegal dice roll. A legal dice roll must be on the right board of the player. The dice must not land on a checker, not outside of the board, not leaning on a checker or the wall of the board. Any of the above is called cocked dice and the dice must be rolled again.
A term for dice that do not land flatly on the rolling surface (i.e. the half of the board to one's right). The roll is nullified, and the dice re-rolled.
When both dice land up against a surface, rather than flat on the craps table.
An illegal roll of the dice. Both dice must come to rest flat (not cocked) on the playing surface to the right of the bar; otherwise they must be rolled again.