The description given to person who is so completely incapable of organising themselves they couldn't organise a piss up in a brewery, usually your boss or a figure that delegates to you, the effects of them being unorganised nearly always has a negative effect on others and not themselves.
My boss is such a fletcher, he lost us a contract with a big retail client because he was playing Golf and was late.
Also referred to "Fletchy" or "Fletch" for short, refers to someone (typically female) who is perceived as preppy,(usually on a sport, cheer, basketball, etc.) but is constantly listening to depressing music and drinking.
I wonder if Amara is a Fletcher... She kinda looks sad all the time even though she's in with the cool kids.