Noun:
1: cracker a thin crisp wafer made of flour and water with or without leavening and shortening; unsweetened or semisweet
2: cracker, redneck a poor white person in the southern United States
3: cracker a programmer who `cracks' (gains unauthorized access to) computers, typically to do malicious things; "crackers are often mistakenly called hackers"
4: banger, firecracker, cracker firework consisting of a small explosive charge and fuse in a heavy paper casing
5: snapper, cracker, cracker bonbon a party favor consisting of a paper roll (usually containing candy or a small favor) that pops when pulled at both ends