Portuguese Snowblower
A sexual maneuver performed by two subjects.  The first subject places themselves on the bed with face, hands, and knees down, and buttocks high in the air.  The second subject places cocaine on the sphincter of the first subject.  The first subject then attempts to fart while the second subject is inhaling the aforementioned cocaine.
So it cost $20 more for the hooker to agree to the portuguese snowblower.  I don't know what she had for breakfast, but it didn't mix well with the blow.