Noun

1. The tough, fibrous stalk of a corn (maize) plant, often ground for silage after harvest.
2. A single specimen of a corn plant once past the seedling stage and which may, at maturity, bear multiple ears of corn.
3. a native (not indigenous) of New South Wales (may be archaic and used pejoratively or even abusively.

   He's a bloody cornstalk. - He is from New South Wales.