party foul (thing)

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

Examples:

• Speaking loudly and unkindly about the person who just walked in behind you.
  
• Hitting on another being's significant other.
  
• Sticking your dick in the mashed potatoes.
  
• Nudity. Well...Male nudity.
  
• Vomiting. Try not to.
  
• Forgetting to take beer out of the freezer.*
  
• Being a dick.
  

Violation of any of these can result in persona non grata status or natural castration, whichever is more applicable to your biological makeup.

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*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"