Definition of hellishing in English:

hellishing

adjective

Australian, NZ
slang
  • As an intensifier: terrible, hellish.

adverb

Australian, NZ
slang
  • As an intensifier: terribly, very.

Origin

1920s. Apparently from hellish + -ing.

Pronunciation

hellishing

/ˈhɛlɪʃɪŋ/