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1.
Cool, tight, gnarly. If someone is treen, they are fun to hang out with and know how to have a good time.
That manny guy is so treen, we've got to hang out with him again sometime.
by manuel kaufman April 26, 2007
 
2.
An adjective describing an unexplainable event of awesomeness.
I don't know what just happened but man that was SO treen!
by SuburbanGuy March 29, 2012