look up any word, like cunt:
 
1.
Australian slang synonymous with American terms such as "hipster" or "scenester".
Those girls are such coolsies with their bangs and iPods.
by Jon Wilcox November 05, 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.
by Nora Kay Figi April 08, 2005