Hi
Let me try to give you a bit Info about that Terms "Ossi" and "Wessi".
As far as I can remember,when I was a Kid(before 1989) the Word "Wessi" was very usual if you were talking about someone from West Germany.The Opposite was "Ossi" used by the west germans,but "Ossi" was more used by west germans after 1989.
I think the most people in east germany used the word "Wessi" because there were just a bit jealous about the West Germans.Because You knew that behind the Wall they can have everything like nice Cars,all kind of Food, the permission to Travel whereever you want to travel and so on.And you felt like the west germans were thinking there are a much better Volk as the poor uneducated east germans and we would live behind the Moon here. At that Time in east germany a "Wessi" was always known as a arrogant Person.
After 1989 the word "Wessi" became even more Meaning,cause everyone was fearing to loose there Jobs. When this was happening in 1989-1991 alot people in east germany were loosing there Jobs,because many big Factorys were takenover by west german agencies called (Treuhand).
Also alot private Wessis came to east germany and claimed to have properties and houses in east germany(owned it before Germany were splitted) and some just kicked out the persons living on or in it.
The word "Ossi" became more usual after 1989.When thousands of "Ossi's) stormed over to west germany,grabbed there 100DM "Welcome-Money" and bought everything there could get for 100,-DM. I can remember the first Time we went to West Berlin, every single Bus or Train or Subway were stuffed with east germans carrying there big plastic bags home

. This Situation went on nearly 2 years until it settled down a bit.
Understandable,the west germans found it quite annoying.Also the west germans didn't like the fact that east germany needed alot money for rebuilding and to get equal to west german standarts in any ways.
But I don't wanna go to deep into that Topic.
Thats my view of the origin and the meaning of the Term "Ossi" and "Wessi".
and its still "Monkeybusiness" between East and West.
By the way,Good bey Lenin is a really funny and good Movie.I liked it alot because it reminds me of the "good old Times"
Not everything was bad in the DDR.
What they should have done is to let the people traveling and drinking Coca Cola

and everything would have been great.cheers
Hope my english isn't to hard to read.
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"Seid bereit,immer bereit"