upstart

Definition
(noun) an arrogant or presumptuous person Definition
(noun) a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class Definition
(noun) a gymnastic exercise performed starting from a position with the legs over the upper body and moving to an erect position by arching the back and swinging the legs out and down while forcing the chest upright Definition
(adj) characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position