n. Facial-anus. Synonym for "buttface", commonly used as an insult.
Michelle: "God, Anne is the worst, she's such a fanus!"
Alex: "I know right? I can smell her from far away!"
A Fanus is a guy with very low testosterone levels and looks like a te year old at the age of 20. They also have a very small dick
That guy looks like a Fanus