"Scam" is usually used to describe those who do not follow the rules, are not trustworthy, are dishonest, or try to evade responsibility. The term is often used to describe someone who deliberately fails to follow an agreement, rule, or law in order to gain an unfair advantage or avoid consequences, such as in an argument, competition, or transaction.

For example, behaviors such as breaking the rules, not fulfilling promises, evading debts, deceiving others, etc. in a competition can all be called "shapy". This behavior is generally considered unethical and may lead to resentment and distrust from others.