I've been thinking about this while I've been doing the garden.I think I was lead astray by the spelling and Tolkien associations of gutorcs.
There is no standard spelling in dialect, and phrases are often elliptical, so maybe Mo and I were trying to be too literal.
"Guttoxed" would look more like the version I understand.
Does it mean something more like, "I'm getting tired, I think I'll call it a day".
"Shut t'yat" standing for "lock up for the night"
Cheers
Dave