from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A pre-planned party in which participants secretively gather in a certain location, wait for the arrival of the person they wish to honour and, traditionally, greet the arrival of the honoured person by shouting, "Surprise!".
from the GNU version of the Collaborative International Dictionary of English
- n. a party of persons who assemble by mutual agreement, and without invitation, at the house of a common friend.
Sorry, no etymologies found.