Drinking an alcoholic beverage, usually beer, at the same time with two or more people at the beginning of a social party/drinking game. Commonly used at the start of flippy cup, drinking a shot with others, etc.
Ready, Set, Go. Clink Sink Drink. (beginning of flippy cup)
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.