sundowner

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Australian A vagrant; a tramp.
• noun Chiefly British A drink taken at sundown.

from The Century Dictionary.

• noun A man who makes a practice of arriving at some station at sundown, receiving rations for that night, and the next morning, when he is expected to work out the value of the rations, vanishing or pretending to be ill.
• noun A physician, holding some government office, who carries on a private practice in the afternoon when government office-hours are over.
• noun One who lives toward the sundown or west.

from the GNU version of the Collaborative International Dictionary of English.

• noun A tramp or vagabond in the Australian bush; -- so called from his coming to sheep stations at sunset of ask for supper and a bed, when it is too late to work; -- called also traveler and swagman (but not all swagmen are sundowners).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Australia, obsolete An itinerant worker, such as a swagman, who arrives at a farm too late in the day to do any work, but readily accepts food and lodging.
• noun Australia, obsolete An itinerant worker, a swagman.
• noun medicine, colloquial A patient, usually demented, who tends to become agitated in the evening.
• noun A cocktail consumed at sunset, or to signify the end of the day; cocktail party held in the early evening.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a drink taken at sundown
• noun a tramp who habitually arrives at sundown