Презентация на тему Slang words are kind of like jargon; they are used in certain groups and understood by the group members. 

begin to be used in a widespread way. This

way, our language renews itself and changes with the times. Slang words show the attitudes of the group or sub-culture that uses them.
Slang can appear as a brand new word, a new meaning for an existing word, an abbreviation for a word, or a word that becomes more generalized than its former, narrow meaning.
It may help to go over what is not considered slang. Slang is not dialect, colloquialism, or catch phrases, where both parties are familiar with the references, like “Beam me up, Scotty” from Star Trek. It is not jargon, which is limited to a certain field, or slogans used in advertising. Graffiti is not slang, nor is any special language used in a secret group.
By the 18th century, the differences between America and other English speaking countries prompted the evolution of slang. For a time, any words not used in Britain were considered slang. Originally considered to be the language of foreigners and criminals, slang began to be used by writers in the 1900s.  

for fun or as a way to be witty

or clever.
You can use it to be different or startling.
Even if you don’t know it, slang enriches the language.
Many use it as a way to be friendly, or to show that they belong to a certain group or profession.
Some engage in slang usage to be secretive, like those in secret societies, children, students, or prisoners. 

Slang is a way of using descriptive or figurative language. It sometimes is irreverent and humorous. Slang expressions describe activities or objects. There is a high number of slang terms associated with the activity or object if it is prevalent. In 1901, G. K. Chesterton wrote “All slang is metaphor, and all metaphor is poetry,” in Defence of Slang.