The word PerfM originates from an online user at freenode. Basically a legend with her smart remarks that pissed off everyone that got a chance to be in her presence.
To troll someone.
Kid1: I was in a car accident and now I have short term memory, can I be excused from this week's assignment?
Teacher: Yes, of course!
Kid2: Wow, that teacher just got PerfM'd!