Shit!!! Is this a dirty word in US? or Bitch!!??
Recently, I learned from my English teacher, Derek, a local American. There are three worst words in U.S. If you said one of them to local people, you probably get a gun shot.
They are "nigger", "cunt", "Fuck".
Nigger is a pejorative term used to refer to dark-skinned people, mostly those of African ancestry. For centuries, it has held negative connotations, and in modern times it is considered a racial slur in most contexts. Modern colloquial uses include a synonym for "person" and an effort to "reclaim" the word for black people (see nigga), which remains a controversial topic -Referred from Wikipedia.
Cunt is an English language vulgarism most commonly used in reference to vulva or vagina and, more generally, the pubis, from the mons veneris to the perineum. The earliest citation of this usage, circa 1230, is in the Oxford English Dictionary, referring to the London street known as "Gropecunt Lane"; as the word "cunt" has been incorporated into the colloquial and technical speech of nautical and other occupational traditions.
Generally, cunt is considered an obscene word, and therefore greatly offensive, although, as with all verbal profanities, some speakers regard it as merely informal or even a term of endearment. Calling someone a cunt is generally considered impolite at best, and often as extremely offensive, though this varies between countries and social groupings –Referred from wikipedia.
Fuck is an English word that, as a verb, fundamentally means "to have sexual intercourse with". Its use is generally considered censurable and offensive in most formal circles, but may also be rather common or expected in certain situations or social groups.
It is unclear whether the word has always been considered vulgar, and if not, when it first came to be used to describe (often in an extremely angry, hostile or belligerent manner) negative or unpleasant circumstances or people in an intentionally offensive way, such as in the term "motherfucker", one of its more common usages.
Fuck is used not only as a verb (transitive and intransitive), but also as a noun, interjection, and, occasionally, as an expletive infix. The etymology of the word is uncertain –Referred from wikipedia.
However, Using shit and bitch is not such a serious problem. Actually, they sometimes use this kind of words to emphasize their emotion. So, my teacher seriously taught us that should not be influenced by movies and some words are so dangerous because this is a crazy country.