Flipping has no connection to “Flipping Someone Off” but is an investment strategy. In this investment strategy, something is bought with the purpose of reselling it a short time later. The term is most used in the housing investment world, where shabby houses are bought, renovated and then sold on to a higher price. In the cryptocurrency world, the term is often used to describe the process of investing in tokens in an ICO, and then quickly selling the relevant tokens when they have been admitted to trading at an exchange.