Mythical holiday often referred to by American servicemen during WWII and the Korean War. Mostly, this holiday was invoked when some trivial (or not-so-trivial) breach of fairness or etiquette was involved: "Hey, what IS this? International Fuck-your-buddy Week?"

Attempts to fix an exact date for this important holiday have been resolutely sabotaged.

There is no set date for International Fuck-Your-Buddy Week; the canonical response to "Hey, what IS this, International Fuck-Your-Buddy Week" is "It's always Fuck-Your-Buddy Week."