one who, or that which, cracks.-a noisy boaster; a swaggering fellow.-a small firework, consisting of a little powder inclosed in a thick paper cylinder with a fuse, and exploding with a sharp noise; -- often called firecracker.-a thin, dry biscuit, often hard or crisp; as, a boston cracker; a graham cracker; a soda cracker; an oyster cracker.-a nickname to designate a poor white in some parts of the southern united states.-the pintail duck.-a pair of fluted rolls for grinding caoutchouc.