traying to honestly answer ms. talldrink's question
Speculation:
Funny, but the word may come from American English. In the early part of the 20th century, Marines lived in the DR as did many sugar mill American executives whom, of course had help in the house. Among the typical shores for these domestic workers was, as it is today, to go to the colmados for groceries etc. on behalf of the household owners. Dominicans may have heard Americans use the phrase "the shopper of my house" and changed it into "la chopa de mi casa".
Anecdotes & Interpretation:
Several decades ago, when I was a child, the term chopa was not one used by anyone in my family or among people considered to be educated. I never heard an adult use it. Children in my family were simply not allowed to utter the word "chopa" when I was growing up, since it was considered both foul language and unacceptable to denigrate anyone based on their social standing and/or race. I only heard it used by kids trying to be cool or to sound street smart. If they used it at home, they would get some time-out or even a therapeutic spanking (una pela). In other words, it was very much chopo (in today's lingo) to use the word chopa (in yesteryear's lingo).
The male counterpart word (chopo) simply did not exist as it does today. I began to hear it maybe in my teens as an adjective or adverb, and later on becoming a noun with its more recent meaning of any number of things but mostly "Dominican nouveau-riche or wannabee". The way I understand it, since I do not use it, is that it is meant more to convey a certain attitude rather than people's actual backgrounds. Folks pretending to belong to a certain social class despite obviously tacky fashions or faux mannerisms, open themselves to ridicule in the process precisely by the people that they most wish to impress, and unknowingly but automatically, are begging for the label of chopo. On the other hand being poor and uneducated without pretending to be no less or no more will not command the stigma of choponess. Nowadays everyone and everything is being labeled chopo. Silly as it is, some Dominicans of the self-appointed higher classes spend precious amounts of energy into cataloguing people based on appearances. They keep their anti-chopo radars on all the time and their chopometers are always tuned up, lest they may be confused with the focus of their obsession. If anything is chopo, that ought to be it.
note; Sarcasm level of the above post: Minimal (1 to 2 value in a 0-10 scale)
-Tordok