Definitions for joe job
An uninteresting, low-level, low-paying job.
An act of e-mail spamming where the sender's identity and address are those of an innocent third party, intended either to tarnish that person's reputation or to flood that person's e-mail with bounces.
The New Hacker's Dictionary
A spam run forged to appear as though it came from an innocent party, who is then generally flooded by the bounces; or, the act of performing such a run. The original incident is described here.