a thin dry biscuit that often tastes of salt and is usually eaten with cheese

a tube of coloured paper that makes a loud explosive sound when it is pulled open by two people. Crackers usually contain a paper hat, a small present and a joke, and are used in the UK at Christmas parties and meals.

<i>Who wants to pull this cracker with me?</i>

something that you think is very good, funny, etc.

<i>I've got a joke for you. It's a real cracker!</i>

an offensive word for a poor white person with little education from the southern US

a person who illegally finds a way of looking at or stealing information on somebody else’s computer system

LEARNit Dictionary