A huge party that involves many people having various kinds of sex. An orgy.
Fletch couldn't believe his eyes when he arrived at Tim's house. He estimated there were about 20 naked moaning people sprawled about the living room in various positions. There were erect penis' penetrating vaginas, asses, mouths, ears, armpits etc. The floor was very sticky and wet due to the copious amounts of missed cum shots, pussy juice and fecal matter.
It turned out that he had been invited to Tim's annual Loadapolooza.