玩命 is an informal, colloquial verb that literally means 'to play with one's life' but is used to mean 'to do something with extreme effort, risk, or intensity — like putting your whole being into it.' It often implies pushing physical or mental limits. You can use it as a stand-alone verb or before another verb to emphasize the reckless or all-out nature of the action, e.g., 玩命工作 ('work like crazy'). It is not usually split apart, though in very casual speech you might hear 玩什么命 ('what are you risking your life for?').