The phrase "instant millionaires" refers to people who become extremely rich very quickly, often from winning a large sum of money or through a sudden business success. Full definition
Three single players had each become instant millionaires in the weeks before that. (cnbc.com)
Their members became instant millionaires by being allocated shiploads of crude, which they sold off at the Rotterdam Spot Market. (ghanapoliticsonline.com)
In 2004, John estimated the sale of his chicken quota would pay out $ 1.1 million, an amount that would make his family instant millionaires. (moneysense.ca)