treelie orginates from the word tree. it's used to describe something like what a tree looks like. or it can be used instead of the word treelie. most people say it to be stupid.
christina: "hohohhohoo.....that tree is like so treelie"
Zenia: "like so totally treelie"
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.