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Noun: pain in the arse
Usage: Brit, Cdn, vulgar (US: pain in the ass)
  1. Something or someone that causes annoyance, inconvenience, or makes life more difficult
    "a bit of a pain in the arse";
    - annoyance, bother, botheration [informal], pain, infliction, pain in the neck [informal], irritation, nuisance

Type of: negative stimulus