When he's not operating on ghouls with a variety of odd ailments, Dr. Barrows spends his time learning the exact medical reasoning for feral ghouls "turning" into glowing ones. For this, ex-patients who succumbed to massive amounts of radiation are placed inside an inaccessible containment chamber adjacent to Barrow's Chop Shop surgery. "Meat" is one of these subjects.
According to the Chop Shop's records, Meat likes chewing on his arm. Meat is in the Chop Shop for observational purposes, along with another glowing one named Ethyl.