nang crackers refers to a popular term used to describe nitrous oxide (N2O) canisters, which are commonly used for recreational purposes, including inhaling the gas for its euphoric effects. Nitrous oxide, often referred to as "nangs," "whippets," or "laughing gas," is typically used in culinary and medical applications, such as whipping cream or providing anesthesia. However, it has gained notoriety in certain subcultures for its recreational use, particularly in Sydney, Australia.