You beauty. What does 'Cozzie' mean in Australia? Your cozzie is your swimsuit. Also, togs, speedos, trunks, boardies, swimmers, swimsuit. 'Cozzie' meaning 2 definitions. : Excellent! Australian slang for 'swimming costume'. [citation needed] Diminutives may be seen as slang, but many forms are used widely across the whole of society.Some forms have also spread outside Australia to other English speaking countries. Very good! Add a Definition Australian slang 'Cozzie' meaning? Diminutive forms of words are commonly used in every-day Australian English.While many dialects of English make use of diminutives, Australian English uses them more extensively than any other. New Aussie slang in your inbox. A Ace! Leave this field empty if you're human: Fair dinkum words and phrases, sent once a week. Swimming suit. Maddie. “Arvo” and Other Aussie Slang Posted on August 25, 2012 June 8, 2020 by jlock Living in Australia has left me no choice but to abandon all the sounds I’ve grown accustomed to and learn an entirely new kind of English: Aussie slang. Aerial pingpong : Australian Rules football Amber fluid : beer Ambo : ambulance, ambulance driver Ankle biter : small child Apples, she'll be : It'll be all right Arvo : afternoon Aussie (pron. swimming costume. Moit. Not all Aussies call them cozzie’s though, they are called different things in different states, another state calls them bathers and my state calls them swimmers.