What does Boxing Day have to do with boxing?
1560s, "of the French middle class," from French bourgeois, from Old French burgeis, borjois "town dweller" (see bourgeoisie). Sense of "socially or aesthetically conventional" is from 1764; in communist and socialist writing, as a noun, "a capitalist" (1883).
It is better to be a good ordinary bourgeois than a bad ordinary bohemian. [Aldous Huxley, 1930]