A muff diver refers to a person who performs cunnilingus or oral sex on a woman. A muff diver can be of any sex or gender. As long as a person likes the taste of a hot and sexy vagina or wants to sexually please a woman they like, he or she can qualify as a muff diver. However, it is still a vulgar term. Describing one's self as a lover rather than a muff diver is more appropriate in most social circumstances.