A reckless, nonchalant attitude or way of doing things, especially toward risks or consequences. I can't believe he went out on his motorcycle in this rain. He lives his life in a devil-may-care manner that's going to get him killed. If you keep treating your finances in this devil-may-care manner, you'll be broke in no time.
See also: manner
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.