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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.
by Kenny_0118899 June 19, 2013
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