arthur
n. countablen. a name for a man. In British slang, people sometimes use it to talk about a person who is not very smart or makes silly mistakes.
n. a male given name of Celtic origin. In specific British colloquial contexts, it functions as a generic placeholder or mild pejorative for a foolish individual, often as part of the rhyming slang 'Arthur Rank' for 'bank' or 'stank'.
Arthur is a very old and traditional name.
The manager called the new intern an Arthur after he accidentally deleted the entire database.
While the name Arthur evokes images of legendary kings and chivalry, its use in modern urban dialects has occasionally shifted toward a more mocking or dismissive tone.
From the name of the legendary king, from Middle English Arthure, from Medieval Latin Arthurus, probably from Middle Welsh arth (“bear”). Other suggestions include Old Welsh arth (“bear”) and ur (“man”), or a Latinized (Romano-British) name; compare Latin Artorius, itself possibly of Etruscan origin, or more likely Messapic-Illyrian related to Proto-Albanian *artsa (“bear”).
After Arthur Guinness, a famous brewer.
When used as a common noun in slang, it is countable and follows standard English naming conventions.