WordNet sense 1 (a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class):

parvenu, arriviste, nouveau-riche

WordNet sense 2 (characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position):

parvenue

WordNet sense 3 (making claim to or creating an appearance of (often undeserved) importance or distinction):

pretentious

WordNet sense 4 (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):

kip