Mouth-watering or jaw-dropping: adjectives formed with body parts (from Cambridge Dictionary Blog)

Let's study a set of compound adjectives (adjectives made from two words) that start with the name of a body part. Unlike compound adjectives where the body part is second (blue-eyed, long-haired, etc.), they tend to be quite idiomatic and in many cases extremely emphatic. (About Words  by Liz Walters)