What does what are fancy talks? mean?

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A "fancy talker" is someone who uses words that others don't understand, usually because they are trying to seem better than everyone else. It is usually said in spite to call someone out for showing off in this way or to discredit someone that one cannot understand. I see this mostly with Southerners and Southern stereotype characters.

Example:
"We've had enough of your fancy talking, Dr. Neil."
"Quit your fancy talking and start making some sense."
"This hospital's just full of these fancy talking doctors and I still don't know what's going on!"