A short form of the word "mayonnaise". Any sort of mayonnaise. Any mayonnaise-like or mayonnaise-derived food.
Figure 2. ...This particular photographed food was oven-baked and served to a company of experienced mayo-stew enthusiasts, including an international traveller who had familiarised themselves with this speciality in its very country of invention. (Source: J∙ Okram - Mayonnaise Stew ● Cooking Recipe.)