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1.
The act of a very obese woman rolling her body up the body of a man who is lying on his back so that the circulation to the lower half of his body is cut off. A very small person or a monkey then plays with his unerect penis.
Dude, last night at the party, Terry's mom and his sister gave me a Bolivian Steamroller.
by MeatSlaughter April 18, 2011
 
2.
While fucking, the man takes a shit on the woman's chest. He then proceeds to rub it in with his knees. While rubbing it in and on his knees, he jizzes on her face.
Oscar gave that bitch a Bolivian Steamroller.
by Clintman August 24, 2006