Thank you so much, virtdave!virtdave said:It means to accept the existing conditions when acting on a problem.
I believe the expression may have originated in the game of golf, where, if your golf ball is badly positioned (like behind a tree) you have the option of tossing it over your shoulder to try to improve the position (and take a penalty on your score) or to try to "play it as it lays" and hit it where it is.