F.A.N. stands for feet,ass and nuts. Its used to describe a person or just a terrible smell usually after a long night of sex
Man 1. I think they were in there fuckin
Man 2. Why do you say that?
Man 1. Cause I went in the room and it smelt like straigt up F.A.N.
Man 2. Fan?
Man 1. Fan. feet ass and nuts
The term is used to describe the combined reek of foot odor, flatulence and scrotum sweat. The term is believed to have origins in the US Navy, where close quarters necessitated by life aboard a ship and rationing of fresh water led to a breakdown of bodily hygiene, leading to the terrible collective odor known as F.A.N.. The acronym has since found use throughout the US military and wherever stinkyness of men living in close quarters is to be found.