Used frequently in teaching hospitals by junior residents and medical students to describe mindless and thankless errands, such as chasing down radiology reports, drawing blood, and staying on hold with public health -- anything which is heavy on the "service" and light on the "education."
Apparently derived from scutwork, meaning "the work of a useless person."
"I don't know if I'll survive grand rounds today. I was up all night running scut."
"I hear rotating at hospital XYZ is a better learning experience than hospital ABC... less scut."