An upstart; a Victorian Era term for someone who claims or tries to act like a gentleman or a person of high class but lacks the qualities to be considered as such.
When a vulgar, blustering fellow asserts that he is a gentleman, the retort generally is, “Yes, a gentleman of four outs,” that is, without wit, without money, without credit, and without manners.
by Flaminghorse July 30, 2018