Top Definition
The act of having a female forcefully shove one of her boobs into a man's anus until lactation occurs.
1. "Dude, I got Susan to give me a Russian Milkshake last night! Best night ever!"

2. "Betty gave Russian Milkshakes to like five guys last night, what a skank. And you wouldn't believe how much milk I had to clean up!"

3. I had to cancel my colonoscopy because Sarah Russian Milkshaked me so hard last night.
by CreativeSex69 March 07, 2011

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