As sightings of missing Thurgood High School teacher Hannah Upp have proliferated, theories about what may have happened to her since she disappeared from her Hamilton Heights apartment last Friday abound. “Apparently, she was petrified of going back to school. She just wigged out and went AWOL,” a law-enforcement source told the Post today. Meanwhile, a Daily News article unearthed from July that identifies Upp as a practitioner of Freeganism — a vegetarian subculture that forages for food in Dumpsters, among other such places — has led some to suspect that she “has embraced that alternative lifestyle full time,” a police source tells the Daily News. “She, right now, is off the grid,” the source said. “If she did join the ranks of this new kind of hobo, we need to know.” Wait a second. Hobo? Is this the same anonymous police source who used the term “wigged out” (a term we haven’t heard used since Cameron Crowe’s 1992 movie Singles) when talking to the Post? If so, we have to wonder: Is this man’s intention in speaking to the press bringing back Hannah Upp? Or funky archaic lingo?