Someone who hosts a talk show (a TV show in which the host interviews or otherwise interacts with guests, often celebrities). As far as Dad is concerned, David Letterman is the king of the gabmeisters.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. a talk show host or hostess. There are so many of these “gabmeisters” that I can hardly keep them straight.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.