The processes by which words become slang are the same as those by which other words in the language change their form or meaning or both. Some of these are the employment of metaphor, simile, folk etymology, distortion of sounds in words, generalization, specialization, clipping, the use of acronyms, elevation and degeneration, metonymy, synecdoche, hyperbole, borrowings from foreign languages, and the play of euphemism against taboo.
The English word trip is an example of a term that has undergone both specialization and generalization. It first became specialized to mean a psychedelic experience resulting from the drug LSD. Subsequently, it generalized again to mean any experience on any drug, and beyond that to any type of "kicks" from anything. Clipping is exemplified by the use of "grass" from "laughing grass," a term for marijuana. "Funky," once a very low term for body odour, has undergone elevation among jazz buffs to signify "the best"; "fanny," on the other hand, once simply a girl's name, is currently a degenerated term that refers to the buttocks (in England, it has further degenerated into a taboo word for the female genitalia). There is also some actual coinage of slang terms.
