Question: The 2006 film directed by Nick Broomfield, known as Ghosts is named in reference to which Cantonese slang term for Westerners or "ghost man"?

Context paragraphs:
The Leader, His Driver and the Driver's Wife: The Leader, His Driver and the Driver's Wife is a 1991 British feature-length documentary film set during the final days of the apartheid regime in South Africa, particularly centring on Eugène Terre'Blanche, founder and leader of the far-right Afrikaner Weerstandsbeweging.  The film was directed by Nick Broomfield and released in 1991.  It received an average of 2.3 million viewers during its screening on Channel 4.  A year later it was the subject of legal action brought by the journalist, Jani Allan, in what has been described as "the libel case of the summer".  In 2006, Broomfield released a follow-up, "His Big White Self".

Tajja: Tajja () is a Korean slang term meaning "professional gambler."  It is also the title of a South Korean comic illustrated by famed Korean cartoonist Huh Young-man and written by author Kim Se-yeong.  It was first serialized in the newspaper "Sports Chosun" in 2000, and upon its publication, became a bestseller among adults of different age groups and both genders.  It was later adapted into the 2006 film "" and the 2008 television series "Tazza".

Zips: Zips (also Siggies or Geeps) is a slang term often used as a derogatory slur by Italian American and Sicilian American mobsters in reference to newer immigrant Sicilian and Italian mafiosi.  The name is said to have originated from mobsters' inability to understand the faster-speaking Sicilian dialects, which appeared to "zip" by.  Other theories include pejorative uses such as Sicilians' preference for silent, homemade zip guns.  According to still another theory, the term is a contraction of the Sicilian slang term for "hicks" or "primitives."  The older Sicilian mafiosi of pre-Prohibition known as "Mustache Petes" (who eventually were deposed by American-born mobsters during the Castellammarese War) were also referred to as zips.

Monster in a Box: Monster in a Box is a monologue originally performed live on stage by the writer Spalding Gray then subsequently made into a 1992 film starring Gray and directed by Nick Broomfield.

His Big White Self: His Big White Self is a 2006 documentary film made by Nick Broomfield.  It is a follow-up to his 1991 film "The Leader, His Driver and the Driver's Wife".  It was shown for the first time as part of More4's Nick Broomfield week which started on 27 February 2006.  The documentary follows Broomfield as he returns to South Africa 12 years after the collapse of the apartheid regime.  His previous film focused largely on JP Meyer, a driver for Eugène Terre'Blanche (the leader of the far-right Afrikaner Weerstandsbeweging), and JP's wife, Anita.

Sarah Palin: You Betcha!: Sarah Palin: You Betcha!  is a 2011 documentary film about Sarah Palin.  Directed by Nick Broomfield and Joan Churchill, the film was produced by Marc Hoeferlin and Cassian Elwes and edited by Michael X. Flores.  Shani Hinton, Sophie Watts and Gregory Unruh executive produced.  The documentary premiered at the 2011 Toronto International Film Festival.  $31,120 was raised through Kickstarter for the film's distribution and advertising.  The film received a limited release in the United States on September 30, 2011.

Gweilo: Gweilo or gwailou (, pronounced ] ) is a common Cantonese slang term for Westerners.  In its unmodified form, it applies only to European ethnicities and has a history of racially deprecatory use.  Cantonese speakers frequently use "gwailou" to refer to Westerners in general use, in a non-derogatory context, although whether this type of usage is offensive is disputed by both Cantonese and Westerners alike.

Ghosts (2006 film): Ghosts is a 2006 drama film directed by Nick Broomfield, based on the 2004 Morecambe Bay cockling disaster.  The title is a reference to the Cantonese slang term "Gweilo" (鬼佬), meaning "ghost man", used for white people.

Diamond Skulls: Diamond Skulls (also known as Dark Obsession) is a British 1989 thriller directed by Nick Broomfield who also co-wrote with Tim Rose-Price.  An established documentary filmmaker, this is Broomfield's first work of fiction.It is produced by Tim Bevan and Jane Fraser and stars Amanda Donohoe, Gabriel Byrne and Struan Rodger and has a music score by Hans Zimmer. It includes the last film performance of Ian Carmichael.

Battle for Haditha: Battle for Haditha is a 2007 drama film directed by British director Nick Broomfield based on the Haditha killings.  Dramatising real events using a documentary style, "Battle for Haditha" is Broomfield's follow up to "Ghosts."  The film was aired on Channel 4 in the UK on 17 March 2008.

Supporting paragraphs: Ghosts (2006 film) Gweilo
Answer: Gweilo