Fast-talk is a phrase often used to refer to someone who speaks quickly and smoothly in order to deceive or persuade. There are several synonymous terms that can be used in place of fast-talk, including smooth-talk, slick-talking, and glib-tongued. Other similar phrases include silver-tongued and honey-tongued. These terms are often used to describe someone who is skilled in the art of persuasion or deception and can sometimes refer to a con artist or manipulator. It's important to be aware of these terms and their connotations so that you can better understand when someone is trying to deceive you with their fast-talking ways!