A Chubalub is an alien species on a world far far away called 'Chubalub World.' They look alike humans and act in similar ways, though are way more advanced than humans in technology.
Guy: "Where we going today, eh?"
Girl: "We're going to Chubalub World!"
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.