slumber party definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a house party at which young teenage girls, dressed in nightclothes, spend much of the night in talk, eating, games, etc.
slumber party definition by American Heritage Dictionary
An overnight party in which guests, usually girls, wear nightclothes, socialize, and spend the night at a friend's home.