Necrotrolling

When a controversial member of an online forum leaves or is kicked out of a group and people keep posting about said user, causing more controversy, this is necrotrolling. The OT (original Troll) has managed to maintain a trolling presence in the forum even after they have gone to its grave

"Yo, did you see Danny's post about KT25 leaving? That thread is heated; there are like 500 comments!"

"Yea, classic necrotrolling right there."