Any of a series of awful mistakes made in a party or gathering situation.
Examples:
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"