Squib/skwɪb/ Definition 1 of 4Pro Tip 1/3Firework Caution Remember 'squib' can refer to fireworks, so use cautiously to avoid confusion with serious use. Be careful with that squib; it's not a toy! Pro Tip 2/3Not Always Loud 'Squib' implies a hissing sound, but the explosion may not be loud. The squib hissed but barely made a noise when it popped. Pro Tip 3/3Underwhelming Result A 'squib' sometimes disappoints, meaning events may not meet expectations. The finale was just a squib; everyone expected more.