To have been irrevocably fucked by a collective.
Being Gand Slopped is typically the case after having been Gang Stalked by a determined group, and similarly to the medieval pillory, it's an act of great humiliation that welcomes public ridicule.
The acts that define being "slopped" include but are not limited to: group surprise sex onto one person, group surprise molestation onto one person, group surprise sexual assault onto one person, surprise humiliation onto one person.
The criteria for "gang" necessitates that the group is not just a band of common thugs, but rather a highly organized and formally operational institution. An organization like the CIA, FBI, DEA, TSA, USPS, British Royal Family, US NAVY, Iran Revolutionary Guard, Israeli Mossad, Russian FSB, and the Walt Disney Company are all possible collectives that could leave a target gang slopped.
A notable figure who was gang stalked by the CIA/Mossad and then went on to be gang slopped is Muammar Gaddafi.
John told me that he was being gang stalked by the CIA for condemning the butchering of children. I thought he was crazy.. Then I saw him end up on the news dead and sodomized. Turns out he was being gang stalked and even ended up getting gang slopped by the CIA!