Slang is the act of shortening words, but making it sound stupid at the same time. Slang is mostly used by people ages 11-13, who want to sound "cool". Slang doesn't have to sound dumb, but it usually does.
slang is the continual and ever-changing use and definition of words in informal conversation, often using references as a means of comparison or showing likeness. some modern slang has endured over the decades since its inception (i.e. cool) and some will only last a few years before being rendered obsolete or outdated (i.e. bling bling). slang can be born from any number of situations or ideas (the word slang itself has come to represent selling, especially of illegal drugs), and can be blunt or riddled with metaphor, and often quite profound.
the use of slang is frequently ridiculed by culturally-ignorant people who feel it is the product of insufficient education and believe it to be counter-evolutionary; of course, they couldn't be farther from the truth. human language has been in a state of constant reinvention for centuries, and slang has been used and created by poets and writers of all sorts (William Shakespeare has been credited for the upbringing of at least a couple of words). it is the right and responsibility of the modern human to keep re-evaluating language, to give dead words innovative contemporary meanings or to simply invent new ones, in order to be more appealing and representative to the speaker/listener (which was essentially the basis behind language anyway, to understandably communicate thoughts or ideas verbally).
the use of and constant flux in slang is the only exciting thing happening in language, making present day especially interesting with the wealth of new words and definitions appearing seemingly everywhere. those who speak ill of slang obviously feel threatened or alienated by the evolution of a language they can't control, and all y'all trick ass marks need to stop running ya gums 'fore y'all gets slapped the fuck up...bitches.
Influenced by different languages, dialects, cultures, sayings, and on some occassions, tone or accent of a voice, the word SLANG caught on as a coined term during the late 80's in Atlanta, Georgia by Madamé Constable Charlotte Hemingsworth VIII as she was famous for speaking in a Southern accent and was too lax to complete phrases during normal conversations. She claims that it was for the purpose of concealing topics amongst close friends from eavesdropping citizens or members of the small community.