A magnate in the oil industry. While in a lucrative business, no one knows exactly what one does other than marry their enemy's granddaughter and fill her belly with his seed.
The placement of one's face, specifically the mouth, into the area between an extremely well-endowed woman's breasts, followed by a rapid shaking of the face in a side-to-side motion accompanied by yelling. The resulting sound that is created sounds similar to an oil tank caught on a reef.
Not to be confused with motorboating which is for smaller breasts.
Oil Tanking - I went to motorboat my woman, but realised her tits were just way to big...I oil tanked her instead.
Oil and water don't mix. When oil is poured into water, it tries to keep itself deprecated from the water. Similarly The proverb is used to describe people that don't "mix" or get along together.
"I'm busy tonight, why don't you ask Tracy to go with you"
"Nah Tracy and I are like oil and water"