Good. Something that one enjoyed.

Lying flat refers to a defeatist lifestyle in Chin, where people stop working, desiring material acquisition, and tap out of any social life – sometimes for good. By lying flat, young people are participating in a kind of non-cooperation movement, rather than surrendering themselves to China's oppressive work culture where they see little hope of social mobility.

A slang term used to describe something positive, very good, cool, great or excellent.

Also see: "outta sight".

Synonyms:

Great, cool, neat, the best, far out, excellent, stellar, nothing better.