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1.
Australian slang synonymous with American terms such as "hipster" or "scenester".
Those girls are such coolsies with their bangs and iPods.
de Jon Wilcox 5 novembre 2005
 
2.
A "cute-ified" term for cool; similar to calling a sip of beer "a sippy of beer".
It's really coolsies that you went to the mall.
de Nora Kay Figi 8 avril 2005