When you go to a foreign place or country you tend to take in some of the traits of the locals who live there. If a person from India was to go to Shanghai he would unconsciously pick up traits from the locals and would therefore be Shanghaied. It's just slang and isn't really part of the English language but is definitely a part of the urban English language. It's just like how we call teens who follow American trends Americanized. The term probably originated in normal conversations and then became popular due to frequent usage.

It is used in following two contexts:

To kidnap (a man) for compulsory service aboard a ship, especially after drugging him.
2. To induce or compel (someone) to do something, especially by fraud or force: We were shanghaied into buying worthless securities

Obviously it is b) meaning forced to do something through trickery.

The term "shanghaied" originated in the Chinese port of Shanghai. There, masters of American tea-clippers delayed for want of crews, would pay the Chinese owners of dives where drunken sailors were carousing, to slip drugs into the seamen's drinking glasses and hustle the unconscious sailors aboard the waiting ships.

If you are Shanghaied then you are forced through trickery to do something against your will. The phrase originated when men were deliberately intoxicated and then found themselves captive where they could not escape doing hard work under duress - often on board a ship.

b). it usually happened to sailors who were abducted. the word "shanghai" may have been used because many of these ships had Shanghai as their destination.

it is B!
trickery, intimidation, or violence.

Forced to do something tricky
How the term originated i do not remember

Shangaied - is now used commonly referring to various situations where you have been subject to trickery or deceit or false information to make you accept a situation, where you find you have been cheated much later. It can range from buying the wrong articles or taking you for a ride with respect to a visiting a specific tourist destination or making you part with something - in very plain words, a form of cheating.

Basically originated sometime in mid-19th Century in China, when Shanghai was the most important trading centre (much before British established Hong Kong as a trading post or Portugese - Macao). The China sea was considered treacherous for sailors in every way - the uncertain climatic patterns, frequent storms and cyclones, treacherous pirates lurking in every corner all the way from Shanghai to the most dangerous Straits of Malacca and in between the the entire South China Sea. No one would want a voyage even with an enticement of untold riches, for the survival chanc ...more

b. Forced to do something -( To induce or compel (someone) to do something, especially by fraud or force: We were shanghaied into buying worthless securities.)
former custom of kidnapping sailors to man ships going to China

it is to force someone by guile to do something.....it meant earlier days in history ....to drug or otherwiase stupefy and take aboard a ship to serve as a sailor.
i got the following bit from wilkipeadia...The American term shanghaied refers to the practice of conscripting men as sailors by coercive techniques such as trickery, intimidation, or violence. Those engaged in this form of kidnapping were known as crimps. Until 1915 unfree labor was widely used aboard American merchant ships.The verb "to shanghai" joined the lexicon with "crimping" and "sailor thieves" in 1850s.The most widely accepted theory of the word's origin is that it comes from the Chinese city of Shanghai, a common destination of the ships with abducted crews. The term has since expanded to mean "kidnapped" or "induced to do something by means of fraud."

a) I was sent to Shanghai?----> no
b) Forced to do something through trickery?----> yes
c) Made to dress like a perosn from Shnaghai?----> no
d) How did this term originate? ----> see link... http://en.wikipedia.org/wiki/Shanghaiing

happy Shanghai-searching..:))