firecracker

/F AY1 ER0 K R AE0 K ER0/
noun
  1. 1

    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.

  2. 2

    A peanut butter cracker baked with marijuana, similar in concept to an Alice B. Toklas brownie.

  3. 3

    A person who is exciting and/or unpredictable.

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Source: https://en.wiktionary.org/wiki/firecracker