What word ending in -ism means an informal style of speech using slang?

Slang is informal speech.

It depends on the type of speech. In an informal speech, slang is fine; in a formal speech, you should avoid slang.

Slang is used in mainly informal or casual speech and sometimes in informal writing.

Informal speech is any use language that would not be acceptable in formal speech or writing (including both colloquialisms and slang). Colloquialisms are informal speech (particularly words and phrases) that are characteristic of conversation, and may also be typical of sub-dialects. Slang is informal speech (words and phrases) that would be considered undignified in certain contexts, or the use of shared synonyms and metaphors to avoid the taboo on certain topics.

Slang is only appropriate for informal or casual speech.

There is no formal slang. Slang is informal language.

Yes, in an informal letter it is OK to use slang.

Everyone uses slang in informal situations.

Yes, English slang is.

No, slang is very informal language.

Language that consists of words and phrases that are informal, are more common in speech that in writing and might be restricted to a particular group of people

In informal situations.

Informal slang for nose

Yes, it's slang for "hello," said among friends in an informal setting.

A biccy is an informal or slang term for a biscuit.

Slang can be used in any language. Slang is an informal use of language or words mostly used by a subgroup of society.

Problably it means they are ending a rap or they're saying bye in slang.

It means "what's up?" 'Sup is being used as a slang for "what is up" yet another slang for "how are you doing" or "what have you been up to". It's a really informal greeting among close friends. "Sup" also means to eat supper.

Formal speech is not slang. Example: Slang: the weather is cool. Formal: the weather today is mighty fine, is it not?

It generally means "spoken language" That includes slang and idiomatic phrases used in everyday speech.

Slang is an informal language, and it's harder to understand than plain language.

Colloqialisms and informal language used in casual conversation.

The absence of slang is a characteristic of formal language. Even in informal contexts, people might avoid slang when speaking to people outside the profession or peer group with which the slang terms are associated.

Yes, slang is the use of informal words and expressions that are not considered standard in the speaker's dialect or language. Slang is often to be found in areas of the lexicon that refer to things considered taboo (see euphemism). It is also used to identify with one's peers. Cite: http://en.wikipedia.org/wiki/Slang

Slang can't destroy anything. It's just informal language. However, slang in a business letter can create an unprofessional impression which you want to avoid.