An incident which involves multiple frapists attacking a
single Facebook account simultaneously.
Gang frapes most notoriously occur when a 4chan user posts an announcement on /b/ that they have hacked the Facebook account of some person (most often a
female) for whom they feel some form of displeasure.
The person posting will also encourage other users to join in on the attack, which inevitably leads to n00bs with un-stealthy tactics ruining the lulz for everyone by making it too obvious to casual observers what is actually happening. This is why
gang frapes are innately fraught with
fail.
A proper frape is carried out by an individual rather than a group, so that a more surgical (and therefore lulzy) strike can take place.