cracker

Concise Oxford English Dictionary © 2008 Oxford University Press:
cracker/ˈkrakə(r)/

▶noun

• 1 a decorated paper cylinder which, when pulled apart, makes a sharp noise and releases a small toy or other novelty.

• 2 a firework that explodes with a crack.

• 3 a thin dry biscuit, typically eaten with cheese.

• 4 Brit. informal a fine example of something.

• 5 a person or thing that cracks something.