pea soup noun 4adjective 1forms 4 noun4 •A thick soup made with dried peas (often split peas) and various other ingredients. •(slang) Thick fog. •A greyish green or dull chartreuse colour, like the colour of pea soup. •(slang, offensive) A French or French Canadian person. adjective1 •Of the color of pea soup (greyish green or dull chartreuse). formspea soups · pea-soups · more pea soup · most pea soup