Slang terms are something of utmost importance to the theme of a game. Different groups talk in different manners. How a street samurai would talk is very different from a corporate salary man. To help players get into the theme, and into character.
You can view slang in the @who or type @slang. If you want to search for the cyberpunk version of a word, try doing '@slang ' like.. @slang fool or @slang gun.
You can also view a compiled list of CP slang here: