The only way you could have landed here is by reading ExR's translation of
MDZS and ending up confused about this word and about not finding it anywhere. Let me tell you, this word probably doesn't exist. K probably wanted and adjective for the way a maniac acts. So,
there you go, that's
theoretically the definition.
"It was a maniatic way to kill others without
dirtying his own hand, a merciless way to instead dirty the hand that fed him." -Chapter 40 of Mo
Dao Zu Shi aka the
Grandmaster of Demonic Cultivation