the smell of a less than fresh vagina, when the smell is detectable and offensive from the moment you walk into a room
Example 1: That is one Feash Vag, you should probably go decontaminate yourself.
Guy 1:"Hey dude what is that smell? I'm dry retching over here"
Guy 2:"Your girlfriend man, her gash is seriously feash, when was the last time you had her cleaned?"
can mean what ever your looking at, can be something bad or a slag