It sounds very like a much more polite variation of what I've heard said about a woman who is believed to be cold or aloof.

http://www.bartleby.com/63/62/6162.html shows a usage along these lines.

http://phrases.shu.ac.uk/meanings/81900.html is mildly interesting.

I note the word "prissy" is often used to convey a cute display of dignity in pets, so maybe the actual usage is similar. The phrase sounds ambiguous -perhaps context and tone carry some of the meaning. I'm guessing this could convey an affectionate verbal expression or a cutting barb, depending on circumstance.


k