Meanings
The expression may originate in regard to the gray catbird (Dumetella carolinensis), as it was in use in the 19th century in the southern United States. It was featured in the 1942 short story "The Catbird Seat" by James Thurber, and popularized by baseball commentator Red Barber, and often referred to baseball. The expression, according to James Thurber, comes from the observation of the catbird (an Australian bird) of the family Ptilonorhynchidae. Some of the male birds will assemble several hundred colored rocks or shells, arranging them in a remarkable artistic display, in order to build a "seat" atop which his mate will eventually be enthroned.
How to pronounce "catbird seat":
An enviable position, often one of great advantage.