"bunny boiler : (slang, humorous, derogatory) A person who acts (or may supposedly act) obsessively..."

“bunny boiler : (slang, humorous, derogatory) A person who acts (or may supposedly act) obsessively or even dangerously towards another person with whom the first person was previously, or wishes to be, in a relationship with.
Boo! Happy Halloween!”

- https://en.wiktionary.org/wiki/bunny_boiler#English

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