The transformation of a human into a cartoon character or creature.
Also refers to when an internet troll stoops to just trying to make other people discover their victims and their plans start devolving and becoming more like those of a saturday morning cartoon villain.
"Did you see Magnum's latest post on EDF forums?"
"Yeah...he wants to make more people hate DrMusic in hopes of making DrMusic's real name unlikable."
"Not just devolving....he's suffering from Toonification."