Green’s Dictionary of Slang

1. pease pudding; thus cannon and khaki, a globular steak pudding and a lump of pease pudding on the side.

1909

J. Ware Passing Eng. of the Victorian Era 162/2: Khaki (Military, February 1900). Volunteer-especially yeomanry volunteer for the Boer war, 1899–1900. Applied in all ways – to pease-pudding amongst many, from the colour. Hence resulted in common eating-houses the order, ‘Cannon and Khaki,’ i.e., round beef-steak pudding and a dump of pease-pudding.

2. (S.Afr.) a non-Nationalist white South African, usu. of English background [Boer War sl. khaki, an English soldier].

1940		Forum 7 Sept. 3: I wonder if Dr. van Nierop’s statement that one Boer is enough for ten Khakies is not perhaps true? [DSAE].
1941		C.R. Prance Tante Rebella and her Friends (1951) 117: That ‘slim trick’ was one more count in the republican indictment against Botha as a ‘Khaki General’, a traitor to the cause of freedom.
1972		Sun. Times (Jo’burg) 11 June 15: We are fighting the English. The fight has been declared against the khakis — the battlefield is wide open [DSAE].
1980		Cape Times 29 Apr., n.p.: This list included lying; bad temper and naughtiness in general; Judas; dim hands; Milner, Kitchener, Jameson and Rhodes; all Khakies; all Englishmen [DSAE].

3. (N.Z.) a Maori.

1960

N. Hilliard Maori Girl 253: They reckon there’s too many fights here, having the whites and the khakis all mixed up together.

4. (US) a county police officer.

1986

R. Campbell In La-La Land We Trust (1999) 90: There were blues and county khakis and detectives and DA’s men all over.

5. (Irish) a lifeguard.

1979

J. Morrow Confessions of Proinsias O’Toole 80: He’d been raided, looted and cuckolded by an assault platoon of Lifeguards. He [...] was well into an eye-rolling, wrist-flapping description of his trials at the hands of the kinky khaki hun.