I thought it was an AAVE corruption of “wretched”. Nurse Ratched was certainly that, but it didn’t derive from the character’s name. Urban Louisiana slang, more like.
Is teaching AAVE a thing anymore or did they decide it was racist? I can’t keep up. I know for a while there was an argument that teaching AAVE at schools was designed to entrench a kind of linguistic class ghetto, but then you also had the liberal “hecking valid” argument, and I’m not sure what the current party line is.