to persuade with facile argument, usually with the intention to deceive or to overwhelm rational objections: The salesperson tried to fast-talk me into buying a suit I didn't want.
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British Dictionary definitions for fast talk
fervent, deceptive patter
to influence (a person) by means of such patter
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