1. person who kills a parent or near relative (1550s), also 2. act of killing parent or near relative (1560s), both from Middle French parricide (13c. in sense 1, 16c. in sense 2), from 1. Latin parricida, 2.
SlangSlang is vocabulary that is used between people who belong to the same social group and who know each other well. Slang is very informal language. It can offend people if it is used about other people or outside a group of people who know each other well. We usually use slang in speaking rather than writing. Slang normally refers to particular words and meanings but can include longer expressions and idioms.
Slang is the use of words that are not considered standard English. It should never be used in academic or professional writing. Often, these words are developed from fads or simple laziness. Sometimes slang is used by a given group and those outside the group do not understand it. Slang can also be insulting to some people or groups. Some slang is associated with certain time periods. In the 1960s, young people used terms like groovy, cool, dude, far-out, and trippin'! Some of those terms are still used.