Answer:
The etymology of any word or phrase evolves in history with its semantic content and its usage.There are multiple aspects of usage ,either through experiments by a single individual as an invented word acknowledged by a social group ,as in the word 'sandwich' or a workable word/slang/phrase used in a particular social working community to become usable phrase and generally accepted as it evolves through a brief phase during its usage, and not any moment in history. Such words find a place in everyday usage.
The marines,the soldiers,immigrant workers etc in time have evolved and contributed to such terminology not only in the English vocabulary but their own native language.
The phrase fast food has acquired an American terminology to mean convenient food that is prepared fast, served fast and quickly packed as take away food evolving other terms like QSR to become a long term established social interact term similar to words in English terminology like Break fast ,as food consumed after a nights fast , or Brunch- a midway meal between breakfast and lunch.
In America the concept of food served fast by vendors for immigrant workers,Industrial and working class quick meals became roadside restaurants term in the automobile age but more rapid during the period 1939-1945 to acquire a common acceptable term in the age of momentous migrations of Latin Americans,Jews,Chinese workers who used vernacular terms like Matza(in Jewish community for food consumed after the long month fast in days of Ramadan for all fasting food as fast food)or terms like Pizza,nando etc in their regionality of culture and cuisine,but in a multicultural setup the standard usage term Fast food was accepted.
A later usage of the word as unsuitable to the health conscious or the elite class was termed Junk Food.
Fast Food acquired a standard usage with time and was introduced in the Merriam Webster Dictionary as an American term in 1951.
Vikings did not start fast food. Fast food was invented by Dick and Mac McDonald (founders of McDonald's) in 1940.
the Eucharistic Fast is the fast from food and drink which is to be observed before receiving Communion.
For people that can't sit down to a meal and for people that are on the go and need fast food because they are lazy. It was also invented for people that are on the go and don't have time to cook a full meal.
Fast Food originate in the United States just after World War I. The first fast food establishment was White Castle, opened in 1916 in Wichita, Kansas.
Relevant to what? McDonald's is the largest, best, and most successful fast food company in the world. They invented fast food since their inception, and although other fast food companies have tried to replicate their success, they cannot truly achieve it in comparison to McDonald's.
Fast food is called fast food because they give it to you fast and it will make you fat fast.
it means your really fast
Dick Clark coined the phrase.
It was used as a fast food by the spanish army a long time ago. It was invented by Tomas de Zumalacarregui.
Simple, because fast food grant people a fast way to death.... Also people called fast food because fast food is quick to make and usually fast food aren't healthy similar to junk food. People who eat fast food everyday in America are usually obese and fat. (No offense)
4chan
Yes, it is a combined phrase: (did something) as fast, as she could (do it). It acts as an adverb of manner, as does quickly.