charley
n. countablen. a person who acts like a fool or makes a silly mistake. You use this word in a friendly way to tease someone for being clumsy or slow.
n. a person who behaves foolishly or exhibits a lack of common sense. Informal in register and primarily used in British English as a mild, non-offensive pejorative.
I felt like a proper charley when I forgot my own keys.
Don't be such a charley; the entrance is on the other side of the building.
While the term is relatively mild, calling a colleague a charley during a formal meeting might still be perceived as unprofessional despite its generally affectionate connotations in casual speech.
Commonly used in the phrase 'a proper charley' or 'a right charley' to emphasize the level of silliness.