a pain (in the neck) idiom  informal      
B2 极其讨厌的人(或事物)
someone or something that is very annoying
  That child is a real pain in the neck. 那个孩子真讨厌。 
 Synonyms: annoyancebore (ANNOYING) bother (ANNOYING) inconvenience irritant (MAKING ANGRY)nuisancepest