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1.
First Originated From Del Boy In Only Fools And Horses. It Grew Popular Around London. As A Result Of Gangs Using It After Two Young Males, Jamie & Marcus Decided To Keep Saying It Till It Caught. Its Now Spread All Around The World.

It Basically Means - Cool
Marcus: We Are Going Pub If You Want To Come With Us
Jamie: Kooshty! Corse I Will
by Veskkk August 14, 2007
 
2.
A person who is easy to bed
that girl is kooshty
by xx-Sxc Playbitch-xx July 31, 2006