upstart

characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position

an arrogant or presumptuous person

a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class

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