'Cracker' definitions:

Definition of 'cracker'

From: WordNet
noun
A thin crisp wafer made of flour and water with or without leavening and shortening; unsweetened or semisweet
noun
A poor White person in the southern United States [syn: redneck, cracker]
noun
A programmer who cracks (gains unauthorized access to) computers, typically to do malicious things; "crackers are often mistakenly called hackers"
noun
Firework consisting of a small explosive charge and fuse in a heavy paper casing [syn: firecracker, cracker, banger]
noun
A party favor consisting of a paper roll (usually containing candy or a small favor) that pops when pulled at both ends [syn: cracker, snapper, cracker bonbon]

Definition of 'Cracker'

From: GCIDE
  • Cracker \Crack"er\ (kr[a^]k"[~e]r), n.
  • 1. One who, or that which, cracks. [1913 Webster]
  • 2. A noisy boaster; a swaggering fellow. [Obs.] [1913 Webster]
  • What cracker is this same that deafs our ears? --Shak. [1913 Webster]
  • 3. A small firework, consisting of a little powder inclosed in a thick paper cylinder with a fuse, and exploding with a sharp noise; -- usually called firecracker. [1913 Webster]
  • 4. A thin, dry biscuit, often hard or crisp; as, a Boston cracker; a Graham cracker; a soda cracker; an oyster cracker. [1913 Webster]
  • 5. A nickname to designate a poor white in some parts of the Southern United States. --Bartlett. [1913 Webster]
  • 6. (Zool.) The pintail duck. [1913 Webster]
  • 7. pl. (Mach.) A pair of fluted rolls for grinding caoutchouc. --Knight. [1913 Webster]