var. Mayonnaisey can also be used to describe things that are generally unpleasant like bad weather, a boring movie, or a yucky meal (see examples below).
Girl #2: "Sure; I'm feeling pretty mayonnaisey so I'm going to need to hit up a McDonald's or that greasy spoon down the street."
var. "It's sort of raining outside; how mayonaissey!" "The movie was so boring, I almost fell asleep. I haven't seen a movie that mayoniassey in a long time." "That lobster was clearly frozen and they put way to much sauce on it. It was almost as mayonaissey as the fish we had last week."