Despite missing or ignoring the hazardous material warning, Blarf is now fed, although probably not in the way you anticipated...
How to Get
Earn the Nutrient-Rich Accomplishment badge by clicking on Blarf until it defeats you.
Blarf is located in Pocket D at (−153.6, 0.0, −780.3)[Copy], unless he's following someone. He follows whomever talks to him until they leave (or use a door or elevator).