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1. a salad/sandwich dressing made from ketchup, mayonnaise, and a few other ingredients, very often pickle relish.

2. a salad/sandwich dressing made from period blood and cum.
You can make a Russian dressing by doing the following: have sex with a girl on her period, cum inside her, tell her not to move while you run into the kitchen and chop up some veggies for a nice little tossed salad (no pun intended), have your girl stand up over the salad bowl, and Voila! - Russian dressing!
by Jedburg Pinopolis December 04, 2009