1. "I can't stand watching soap operas anymore, the dialogue is always so overcooked".
2. "Wow, you spent way too much time in the sun today. You're totally overcooked!".
As it is very hard to overcook Pak Choi due to it's crispy nature, we can ascertain that this saying is used to denote the action of ingesting far too many drugs or units of alcohol.
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.