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1.
Champagne with vodka. Preferably with a flavored vodka
The only thing that can make this day better is a Russian Mimosa!
by Surg1ner September 06, 2014
 
2.
An alcoholic beverage consisting of vodka and orange juice, also known as a screwdriver.

This term can be used to describe a screwdriver that is being imbibed before noon.
"We're clearly not alcoholics, we're drinking russian mimosas with our breakfast."
by DragoIvanIII August 20, 2012