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."
Two or more snowplows plowing a multi-lane highway in a specific fashion where the one in the innermost lane is just a few metres ahead of the next one, and so on, ensuring snow is bumped from the inside lane right on out to the outside shoulder.
Also known as "echelon plowing."
"It took me hours to get home. I got stuck behind a congo line."
"We've had 6 cm of snow within an hour and the congo lines are already out."