ARVO Meaning of ARVO in English /ahr"voh/ , n. Australian Slang.afternoon. [ 1930-35; AF(TERNOON) + -O, with voicing of -f-; ar is r-less speaker's representation of low back vowel ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012