cracker

noun

• 1a person or thing that cracks.
• an installation for cracking hydrocarbons: a catalytic cracker
• a person who breaks into a computer system, typically for an illegal purpose.

• 2a decorated paper cylinder which, when pulled apart, makes a sharp noise and releases a small toy or other novelty:a Christmas cracker
• a firework that explodes with a sharp noise.

• 3a thin dry biscuit, typically eaten with cheese: the sausage is delicious on hot toast or crackers
• a light crisp made of rice or tapioca flour:prawn crackers

• 4British informal a fine example of something:don’t miss this cracker of a CD
• an attractive person, especially a woman: you look a cracker

• 5US offensiveanother term for poor white.