fack in English dictionary fack Meanings and definitions of "fack" noun (Britain dialectal) One of the four stomachs of a ruminating animal; rumen; paunch. verb (Britain, eye dialect, Cockney) fuck more Grammar and declension of fack fack (plural facks) fack (third-person singular simple present facks, present participle facking, simple past and past participle facked) more Sample sentences with "fack" Declension Stem Try again Available translations Estonian Authors