oliver
n. countablen. a person who is very annoying or foolish. You use this word in British slang to describe someone who makes silly mistakes or acts in a way that bothers you.
n. a person perceived as foolish, clumsy, or irritating. Primarily British slang; often used as a mild pejorative in informal social contexts.
Don't be such an Oliver and pay attention.
He forgot his keys for the third time this week, acting like a total Oliver.
While the term is often used affectionately among friends to mock a minor blunder, calling a stranger an Oliver in a heated argument can be seen as a genuine insult.
From Middle English Oliver, from Old French Olivier, by folk etymology derived from the Latin name Olīvārius, but probably representing an Old High German form of Old Norse Óleifr (“ancestral + relic”) (modern Danish Olaf and Swedish Olof), or Proto-Germanic ala- (“all”) + wēraz (“true”) (modern Swedish allvar). Name of a paladin of Charlemagne in medieval French romance.
Commonly used in the phrase 'a bit of an Oliver' or 'a total Oliver'.