I’ve heard the term flip ever since I was a little girl. Thinking back, it did have more to do with the Mob. Once it became popular in the movies, the boys in school picked up on it & started using it. Now days, people flip houses all the time. For Trump’s purpose, it’s people, who have pledged their loyalty to him & then when arrested & pressed for info, they flip over & run their mouths in effect forgetting what the word loyalty means. In other words, they feed his ego in order to make a fast buck. They make their profit & don’t care about being loyal anymore. They flip flop which has been shortened to flip.