card tart

noun

informal a credit-card holder who continually changes providers, transferring his or her balance to another provider whenever the agreed period of low interest on the prior loan is about to expire

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012