Miss Priss
A girl who is stuck up and a goody two shoes and thinks everything is childish. She believes she is better than others, which is reflected in her attitudes and actions. Girls generally start qualifying for this label around middle school. Some grow out of it, but others retain the label even in adulthood.
"When did Jenny turn into a Miss Priss?"
"That woman is such a Miss Priss. It is annoying to be around her."
"That woman is such a Miss Priss. It is annoying to be around her."