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KOSY is the short form of "King of Snake Yellow". It is originally from a HK popular's palm user message board - www.pumb.org

"Snake Yellow" is means doing your own things during the working hour, e.g. surfing on net, watching newspaper, etc.
Oh ~ your guy is kosy in PUMB now, what's a good thing!
by ac520 February 04, 2005
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