Uppity. Inclined to be haughty, snobbish, and/or arrogant.
This term came into the English language in the seventeenth century when an extremely high (8 to 26 inches) platform shoe called the “chopine” was popular with the aristocratic ladies. This style of shoe enabled them to (literally) “look down” on folks of lesser status, and for the later to label the chopine wearers as “uppity.”
(Information provided by “The Complete Footwear Dictionary: Second Edition” by Dr. William A. Rossi, 2000.)