Green’s Dictionary of Slang

when-we n.

[the common use of when we were in ... to start a bitterly nostalgic sentence]

(S.Afr.) an immigrant from a country once part of the British Empire who maintains their old beliefs, including feelings of racial superiority. Such figures, who were often middle-ranking administrators, also despise the South Africans among whom they have been forced to live. The type, drawn to S. Africa by apartheid, have presumably all but died out since majority rule.

[UK]Indep. on Sun. 1 Aug. 16: When-we: A South African who emigrated from another colonial territory (as in ‘when we were in Kenya’).