in intercultural communication, what does "code switching" refer to?

Answer 1

Code switching is the juxtaposition of passages of speech belonging to two different grammatical systems within the same speech exchange. (i.e. the mixing of different languages within a conversation)
If code switching is used without any problems and not for compensating lexical deficits it's a sign of perfect bilingualism.

There are different types of code switching:

intersentential - between sentences
We have all learned to speak English. Hablamos espanol en casa.

intrasentential - within a sentence, also referred to as code mixing
I have lived in Miami for a long time, pero soy cubano.

Answer 2

Code-switching is a term in linguistics that refers to alternation between two or more languages, dialects, or language registers in a single conversation.

In the United States, a country with a large number of Spanish speaking communities, a sentence might contain a mixture of Spanish and English words. It is so common that a slang term, spanglish, refers to this.

Answer 3

According to--http://en.wikipedia.org/wiki/Code_switching
"Code-switching is a term in linguistics referring to alternation between two or more languages, dialects, or language registers in a single conversation, stretch of discourse, or utterance between people who have more than one language in common.". . .
More at source.