'Strain Share definition Flag 1. Short for Australian. 2. The common slang language used by most working class Australians. "1. I am, you are, we are 'Strain." "2. I'm no good at English, but I can speak good 'Strain mate." 'Strain by Muggus November 26, 2003 0 0 Get merch Get the 'Strain mug. Buy Now — $32.95 See more merch