Device containing sulphurous matter traditionally loved by naughty boys

• Item used in some juvenile pranks
• Smelly prank
• Prankster's detonation
• Object used in some pranks
• High school prank component, maybe
• Prankster's smelly explosive
• Protester's tool, maybe

Wiktionary Word definitions in Wiktionary
n. 1 An explosion of unpleasant odors, like rotten eggs, garbage, or other unpleasant odors. 2 A device that produces such burst of unpleasant odors.