A common delusion afflicting the self-styled "nice girl" (who may be either male or female), which consists of the mistaken belief that he/she is soooo superior to the "great unwashed" masses that he/she is excused from the indignity of being subject to the same natural bodily functions as the rest of us. One specific sense of the word denotes sexual frigidity -- i.e., "nice girls" don't have orgasms; they only submit to sexual intercourse in order to fulfill their duty to God and Country.
The girl acts as though she had a Tastee Freez dispenser up her butt. Pretends the thought of having sex has never entered her mind. Yeah, right, and nice girls shit ice cream.
Kate Winslet was explaining to David Letterman last week about the cold water they had to shoot in while doing "Titanic", and how Leonardo DiCaprio whined and moaned about the water being too cold. She called him "A big girl's blouse".
1) A guy who is so nice to every girl he knows that before he knows it, everyone is past the "Friend" threshold and thus impossible to date due to the "I don't want to mess up what we have" argument.