You occasionally hear this in old black-and-white detective movies. It means 'private detective'. It's from back in the 1920s, when 'dick' used to mean 'detective.'
Dick Richards Private Dick - 2005 was released on: USA: 28 February 2005 (internet)
Private Dick - 2015 was released on: USA: 2015
Private Dick. - - - - - "Gumshoe"
Private dick phrase comes from series of very popular Victorian 'Penny-dreadfuls' (cheap paperback detective novels) by Dick Donovan, the pseudonym for 19th Century English writer JE Preston Muddock. His character 'Dick Donovan' was a private eye, and after the success of the Dick Donovan books, detectives began to be called "Dicks".
Totally Busted - 2003 Private Dick 3-9 was released on: USA: 27 August 2005
The cast of The House Dick - 1931 includes: Jimmy Savo as The Private Detective
The slang terms I'm familiar with are: P.I. Private Eye, Peeper and Dick
Duckman Private Dick Family Man - 1994 I Duckman 1-1 was released on: USA: 5 March 1994
The Dick Powell Show - 1961 Last of the Private Eyes 2-30 was released on: USA: 30 April 1963
Duckman Private Dick Family Man - 1994 About Face 1-12 was released on: USA: 4 June 1994
Duckman Private Dick Family Man - 1994 Apocalypse Not 3-7 was released on: USA: 24 February 1996
Yes, male= Dick and penis female= pussy and vagina