brand Nazi

noun

1. informal.
   a person who insists on buying one particular brand of clothing or other commodity

Example Sentences

Preamble In 1819, when the self-educated mill-worker William Collins began to dream of knowledge for all and chose to devote his life to creating a dictionary, he probably did not envisage a day when it would include words and phrases such as chavtastic, brand Nazi, soz, busty, beer o'clock, Smythchic and LOL.

From The Guardian