I think she means "don't be phony"
the key phrase is "try to impress..." Don't try to come off as something you're not, and don't try to fake being something more than you are. Don't use words unless you are 100% sure of what they mean and that you're using them correctly. I Remember a post about the fellow who claimed to be an expert on "C-Pound," thinking that would impress the interviewer. It sure did...
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