Definition of "Cracker" :

noun: a party favor consisting of a paper roll (usually containing candy or a small favor) that pops when pulled at both ends

noun: firework consisting of a small explosive charge and fuse in a heavy paper casing

noun: a thin crisp wafer made of flour and water with or without leavening and shortening; unsweetened or semisweet

noun: a programmer who cracks (gains unauthorized access to) computers, typically to do malicious things

"Crackers are often mistakenly called hackers."

noun: a poor White person in the southern United States