Definition of balls-achingly in English:

balls-achingly

adverb

(also ball-achingly)
vulgar slang British as submodifier
  • To an annoying or tedious degree (used for emphasis)

    • ‘don't be so balls-achingly adolescent’

Pronunciation

balls-achingly

/ˈbôlzˌākiNGlē/ /ˈbɔlzˌeɪkɪŋli/