Superlative form of prissy: most prissy.(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "prissiest" in a sentence
"Cairo has spun a tale that will make even the prissiest woman on earth become fascinated with performing oral sex on her man."
"The second of three children, Ms. Howard grew up in Orlando, Fla., "the prissiest tomboy," according to her mother, whose maiden name was Traylor."
"What's really shocking is that America's prissiest hostess agreed to go public on the same day as those Neanderthals from the World Wrestling Federation."