Wiktionary
alt. 1 (context British Canada informal English) A dense, yellowish fog. 2 (context Canada slang derogatory English) A French-Canadian person, especially a Francophone from the province of Québec. n. 1 (context British Canada informal English) A dense, yellowish fog. 2 (context Canada slang derogatory English) A French-Canadian person, especially a Francophone from the province of Québec.
WordNet
n. a heavy thick yellow fog [syn: pea soup]
Usage examples of "pea-souper".
The fog was thick and brown as only a London pea-souper could be and tasted sour at the back of the throat.
Looks like a pea-souper to me, Watson, Richie thought, and for a moment he imagined himself as Sherlock Holmes (a Holmes who looked a great deal like Basil Rathbone and who was totally black and white), moving purposefully along Baker Street.