the counterpart to the common term "wash down". to "chunk down" is to eat food because you have a drink that is better with food, or solid to chew and absorb the drink's flavor. this does not have to be alcoholic, but can be.
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.