The multiple atrocities and extremist ideology that the Nazis followed have made them notorious in popular grammar as well as history. The term "Nazi" is used in various ways. So are other Third Reich terms like "Führer" (often spelled "fuhrer" or less often, but more correctly, "fuehrer" in English speaking countries), "Fascist", "Gestapo", "uber/ueber" (from Übermensch, superior person, Aryan as opposite to Untermensch) or "Hitler". The terms are often used to describe individuals or groups of people who try to force an unpopular or extreme agenda on the general population, and also commit crimes and other violations on others without remorse. The terms are often simply used as an insult.
In the context of the Western World, Nazi or fascist is also sometimes used by (generally Left-wing) opposition to malign political groups (such as the French Front National) advocating restrictive measures on immigration, or strong law enforcement powers.
Critics of Israel have recently taken to using comparisons with the Nazis in describing its treatment of Palestinians, particularly with regards to Israel's separation barrier on the West Bank. Some regard this usage to be antisemitic.
The terms are also used to describe anyone or anything seen as strict or doctrinaire. Phrases like "Open Source Nazi", "Grammar Nazi", "ubergeek" and "Feminazi" are examples of those in use in the USA. These uses are offensive to some, as the controversy in the popular press over the Seinfeld "Soup Nazi" episode indicates, but still the terms are used so frequently as to inspire "Godwin's law".
More innocent terms, like "fashion police" also bear some resemblance to Nazi terminology (GESTAPO, Geheime Staatspolizei, secret state police) as well as references to Police states in general.
It can also be found that German-sounding or German-looking spellings of English words are used to claim superiority in some area, or to create some impression of power or brutality. For example, to give English words a German touch the letter 'C' is often replaced by 'K', like "kool" or "kommandos". A well known example of "germanization" of names are the names of heavy metal bands like Mötley Crüe, or MOTÖRHEAD. See Heavy metal umlaut.
Another similar effect can be observed in the usage of typefaces. Some people strongly associate the Fraktur typeface with Nazi Germany propaganda (although the typeface is much older, and its usage was banned at some time in Nazi Germany). A less strong association can be observed with the Futura typeface, which today is sometimes described as "germanic" and "muscular".