The Nineteenth hole is a slang

Slang

Slang is the use of informal words and expressions that are not considered standard in the speaker's language or dialect but are considered more acceptable when used socially. Slang is often to be found in areas of the lexicon that refer to things considered taboo...

 term used in golf

Golf

Golf is a precision club and ball sport, in which competing players use many types of clubs to hit balls into a series of holes on a golf course using the fewest number of strokes....

, generally referring to a pub, bar

Bar (establishment)

A bar is a business establishment that serves alcoholic drinks — beer, wine, liquor, and cocktails — for consumption on the premises.Bars provide stools or chairs that are placed at tables or counters for their patrons. Some bars have entertainment on a stage, such as a live band, comedians, go-go...

, or restaurant

Restaurant

A restaurant is an establishment which prepares and serves food and drink to customers in return for money. Meals are generally served and eaten on premises, but many restaurants also offer take-out and food delivery services...

 on or near the golf course

Golf course

A golf course comprises a series of holes, each consisting of a teeing ground, fairway, rough and other hazards, and a green with a flagstick and cup, all designed for the game of golf. A standard round of golf consists of playing 18 holes, thus most golf courses have this number of holes...

, very often the clubhouse

Clubhouse

Clubhouse is an American drama television series starring Jeremy Sumpter, Dean Cain, Christopher Lloyd, Mare Winningham and Kirsten Storms. The theme song is "Our Lives" by The Calling....

 itself. A standard round of golf has only eighteen holes, so golfers will say they are at the 'nineteenth hole', meaning they are enjoying a drink after the game. The concept is similar to Après-ski

Après-ski

Après-ski refers to going out, having drinks, dancing, and generally socializing after skiing. It is popular in the Alps, where skiers often stop at bars on their last run of the day while still wearing all their ski gear. The concept is similar to the nineteenth hole in golf. This can also...

 in skiing

Skiing

Skiing is a recreational activity using skis as equipment for traveling over snow. Skis are used in conjunction with boots that connect to the ski with use of a binding....

. In miniature golf

Miniature golf

Miniature golf, or minigolf, is a miniature version of the sport of golf. While the international sports organization World Minigolf Sport Federation prefers to use the name "minigolf", the general public in different countries has also many other names for the game: miniature golf, mini-golf,...

, the 19th hole on most courses is usually the hole that one can putt to win a free game.
The 'nineteenth hole' is also a slang term meaning the place where they bury people who get in the way.

The golf stories of author P. G. Wodehouse

P. G. Wodehouse

Sir Pelham Grenville Wodehouse, KBE was an English humorist, whose body of work includes novels, short stories, plays, poems, song lyrics, and numerous pieces of journalism. He enjoyed enormous popular success during a career that lasted more than seventy years and his many writings continue to be...

, which are narrated by his character, the Oldest Member

Oldest Member

The Oldest Member is a fictional character from the short stories and novels of P. G. Wodehouse. He narrates the majority of Wodehouse's golf stories from the terrace of a golf club whose location is unclear, and he never has a proper name....

, discuss the nineteenth hole.

At the beginning and towards the end of the Lars von Trier

Lars von Trier

Lars von Trier is a Danish film director and screenwriter. He is closely associated with the Dogme 95 collective, although his own films have taken a variety of different approaches, and have frequently received strongly divided critical opinion....

 movie Melancholia, the main character Claire is shown as she passes the nineteenth hole on the golf course belonging to the mansion where the movie takes place. The 'funny' thing about this is that the owner of the estate explicitly mentions that the golfcourse has 18 holes.