One who is ready to do odd jobs (piece-work) in his own line.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
More on Jobbing Carpenter from Fact Monster:
- Lindbergh Kidnapping - On April 2, Lindbergh and Condon met a man claiming to be a kidnapper in a Bronx cemetery. Condon gave the man the ransom, $50,000 in marked U.S. gold certificates, which were to be withdrawn from circulation in 1933, making them hard to dispose of casually.