When you capture a Wild Boar (preferably from the wild) and kill it.
You then take the corpse of said Wild Boar, cut off it's head for more entry points.
Then you and your buddies begin to have sex with both ends of the decapitated boar.
Person 1 - Wow, me and my buddies had a decapafuck yesterday.
Person 2 - My god, that's disgusting! What's wrong with you?
Person 1 - Lol yeh