One of the things we require here is that you give the full sentence in which the phrase was found, along with a little background and context. That will help us make sure we're giving good information.
The whole sentence goes like this: "He hummed an airy strain as he blackened the tip of his nose. And it comes from a comic novel written by P. G. Wodehouse. The story is full of good-natured and eccentiric characters enduring some funny complications to reach the happy ending.