A sex act a woman(usually) lies with her legs in the air. An umbrella with a small hole cut at the very tip is then placed inside the rectum. The umbrella is opened and vodka is poured into the umbrella and funnelled into the rectal cavity to invoke sexual pleasure.
Just like "2 Girls 1 Cup", the "Russian Sombrero" is fast becoming a disgusting internet phenomenon.
by Ryan Fitspatrick May 09, 2008