Any of a series of awful mistakes made in a party or gathering situation.
Violation of any of these can result in persona non grata
status or natural castration
, whichever is more applicable to your biological makeup.
*Ouroboros' way of apologizing to Roninspoon for his own "party foul".
Update: 08/08/02 - Ouroboros
says re party foul: another addition "sleeping in the host's bed without explicit permission or pleasure of the host"