bankster UK /ˈbæŋkstə/US /ˈbæŋkstɚ/ noun1 •(informal, disapproving) A banker who is seen as criminally irresponsible, or as extorting bailout money from the taxpayers.Stop supporting bums abroad. Stop all foreign aid, which is aid to banksters and their bonds and their export industries. — 1992 formsbanksters