Green’s Dictionary of Slang

(Aus./N.Z.) hurry up!

1965		W. Dick Bunch of Ratbags 310: ‘Carn Goodway,’ I screamed out as the emotion I felt for Mr Huntington began to build up.
1988		McGill Dict. of Kiwi Sl. 25/2: carn! shortened form of the encouragement ‘come on!’ used frequently by antipodean sporting spectators; eg ‘Hey, youse jokers, we can make the ferry if we step on it. Carn, will ya.’.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].