Snake eyes is a term often used in gambling when a player rolls two ones on a pair of dice. But there are several other synonyms and terms that are used to describe the same situation. Some of the popular ones include double aces, boxcars, devil's eyes, or twin ones. The term craps is also used when a player rolls a total of two on the dice. Some variations of the traditional term include dog eyes, horse eyes, and pigeon eyes. Regardless of the term used, rolling snake eyes is considered unlucky in most games involving dice.