Well here are the entries for Gooncamp. (Special guest appearance by Fire)
Gooncamps were meetups famous for everyone getting drunk and doing stupid shit outside rather than in a basement. I know one got cancelled because of getting reported for drugs. And if I remember right, another was basically a mud pit because of rain and poor choice of campsite.
I know the emote comes from one of the gooncamps where a goon and goonette went ass to mouth in a tent, oblivious to all the others gathered around outside listening
(and possibly watching their silhouettes through the lit tent as well). Somewhere there were a bunch of pics of the camp, and someone pointed out the goons involved. Neither were exactly easy on the eyes which made the story all the more horrifying.