Rm

RM is the Hacker attack unlocked at Level 42. Once used, the attack removes the last NPC post from the thread the player is pwning. it causes a damage ranging from 325 to 350.

Trivia

"RM" is the command of "Remove" on Linux

For much long no one knew what this atack did. After a thread, some prints and a helluva fun, finally a user discovered this and did this entry on Spoilerpedia