Top Definition
A term used mostly by students from neighborhood schools in Singapore to express either excitement or complete disinterest. Loosely translated, it means "that's cool."
A: DUDE IT'S SNOWING OUTSIDE.
B: KOOLSIOL LET'S GO OUT AND PLAY.

A: Hey check out this awesome thing I found.
B: koolsiol
by Mud McMudderson December 04, 2010

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