The Second Commandment Taboo is a game in which players must guess a word or phrase without using any of the five words associated with it. The word or phrase is usually related to a particular topic, such as religion or culture. In this case, the word is 'IDOL, ' which has four letters. The goal of the game is to guess the word without using any of the five taboo words associated with it. Players must use their creativity and knowledge to come up with the correct answer.