Pulls Out; meaning : when a male is having sexual intercourse and is about to ejaculate or 'cum'. He 'pulls out', by pulling his penis out of his partner.

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.