Wikipedia
Russian dressing is a salad dressing invented in Nashua, New Hampshire, by James E. Colburn, likely in the 1910s. Typically piquant, it is today characteristically made of a blend of mayonnaise and ketchup complemented with such additional ingredients as horseradish, pimentos, chives and spices. It is unknown in authentic Russian cuisine.
A variation is known as red Russian dressing, and is very much like Catalina / French Dressing.
Russian Dressing is a short theatrical cartoon by Columbia Pictures, featuring Krazy Kat.
Usage examples of "russian dressing".
She picked up her sandwich again, licked Russian dressing off her fingers.
He requested bacon, lettuce and tomato with Russian dressing and thick slices of onion, and I cooked the bacon well in the microwave instead of frying it.
The salad wasn't bad, but I didn't like the little men in loincloths who kept dipping their arrows into the Russian dressing.