Definition
"Cacoethes" refers to an irresistible urge or compulsion to do something bad or unwise. It's like a persistent itch you can't help but scratch, even though you know you shouldn't. It often implies a destructive or self-destructive tendency. The term is usually used in a figurative sense to describe a bad habit or an obsession. Basically, it's an overwhelming urge to do something you know you'll regret.