Choinch is anything and everything. This word can be used as a verb, adjective, noun, all of it. Such a word is not bogged down by futility of meaning.
Your are being such a choinch right now.
He guys, would you like to go choinching later?
Oh wow! Look at that choinch over there!
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.