The term 'defective firecrackers' refers to firecrackers that are not functioning properly and are therefore considered DUDS. The term 'DUDS' is a slang term for items that are defective or do not work as intended. Firecrackers are explosive devices that are used to create loud noises and bright flashes of light, usually for celebratory purposes. Defective firecrackers are dangerous and can cause injury if they are used.