Where did the phrase stuffed to the gills come from?

Well, honey, the phrase "stuffed to the gills" likely originated from the literal meaning of the Word "gills" referring to the openings on the side of a fish's head used for breathing. When a fish is full of food, its gills are often bulging or "stuffed," hence the expression. So, next time you're feeling as full as a fish, you can thank our aquatic friends for the inspiration behind this colorful phrase.