bunny boiler

Etymology
From a scene in the 1987 film  where a scorned woman (played by ), seeking revenge on her ex-lover (played by ), places his family’s beloved pet rabbit in a pot of boiling water when he is away from the house.

Noun

 * 1)  A person who acts (or may supposedly act) obsessively or even dangerously towards another person with whom they were previously, or wish to be, in a relationship.