* Dishonest: The "dirty" part suggests they're morally corrupt or deceptive.
* Harmful: The "parasite" aspect suggests they take advantage of others for personal gain.
* Unworthy: The overall meaning is highly derogatory, suggesting the person is contemptible and deserves scorn.
It's important to note that using such a strong insult is generally considered inappropriate and offensive. It's rarely used in polite conversation, and it's likely to cause anger or hurt feelings.