1. Anyone who corrupts other people; such as, a seducer to lewdness or some unacceptable activities: The old roué, or lecherous man, was a renowned debaucher who enjoyed his wicked reputation.
2. Those who behave in morally unacceptable ways which probably involve drinking too much alcohol, taking drugs, having sex with many people, etc.: The wild crowd of debauchers often gathers at the local "Madam’s House" for evenings of lewd and immoral parties.