a person who has recently or suddenly acquired wealth, importance, position, or the like, but has not yet developed the conventionally appropriate manners, dress, surroundings, etc.
I'm certain that there are several television shows with an episode that features the generally classless, tacky main character becoming a parvenu, but I cannot for the life of me think of one. I suppose the entire married portion of The Nanny counts, though... (I love that show).
shibboleth [SHIB-uh-lith, ‐leth]
a peculiarity of pronunciation, behavior, mode of dress, etc., that distinguishes a particular class or set of persons.
2. a slogan; catchword.
3. a common saying or belief with little current meaning or truth.
You may note upon visiting the United States that each region has its own shibboleth in speech, allowing careful listeners to distinguish each person's region of origin.
DAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH. My apologies for missing so many weeks in a row; my last college semester is veritably chomping on my soul. I'm going to post two words for the next two weeks to make up all those I missed.