The phrase "oil billionaire" refers to a person who has become extremely rich by owning or investing in oil-related businesses. They have accumulated a significant amount of money through their involvement in the oil industry. Full definition
That was a fraction of what Exxon Mobil or the conservative oil billionaire Koch brothers donated to climate sceptic groups that year. (theguardian.com)
The Greenpeace Airship A.E. Bates flies over the location of oil billionaires David and Charles Koch's latest secret political strategy meeting, with a banner reading «Koch Brothers: Dirty Money.» (greenpeace.org)
The Black List screenplay, written by David Scarpa, centers on the 1973 kidnapping in Italy of J. Paul Getty III — the rebellious teenage grandson of oil billionaire J. Paul Getty, who was reluctant to pay the $ 17 million ransom demanded by the kidnappers. (filmcutting.com)