The word was seen used in the context of a person recommending a book.
A critic responded, claiming the author had no real expertise, and that the content of the book should be taken with "a grain of salt".
The implication is that by writing the book, the author is an expert on the subject matter. The critic's stance was that shouldn't be an assumption. He used this word to describe the author.
I do recall looking the word up in the dictionary at one point, and if memory serves, this is (more or less) how the word was defined:
A person who perceives himself to be an expert (particularly in the arts), but that possesses no actual expertise.
What is this word I'm looking for?