1) (brit. slang) crazy or insane
2) a small kind of firework filled with powder, which explodes with a sharp noise or with a series of sharp cracks.
3) one who breaks open, into, or through, as a safe, a secret code, or a barrier.
4) a thin, crisp biscuit.
5) one who throws out or utters with smartness.
(example) I dont eat crackers in church.
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