As a noun, the gift of eternal youth, though not in a good way. As a verb, thoroughly unsuitable.
And, stop reading if you know this bit - one of my standard rants - there's a character called
Fawn in the early Le Carre novels who is a security officer with passionate loyalty to Smiley and an equally passionate desire to mutilate anyone he doesn't like the look of as well as anyone that his seniors would like information from. No indication of whether
Fawn is a name (fn? ln?), a nickname or a strange attempt at a joke. But, he has his uses!