Definition from Wiktionary, the free dictionary
firecracker (plural firecrackers)
- A small explosive device, typically containing a small amount of gunpowder in a tightly-wound roll of paper, primarily designed to produce a large bang.
- A peanut butter cracker baked with marijuana, similar in concept to an Alice B. Toklas brownie.
- A person who is exciting and/or unpredictable.