"It's a ticklish sort of job making a thing for a thing-ummy-bob
Especially when you don't know what it's for
But it's the girl that makes the thing that drills the hole
that holds the spring that works the thing-ummy-bob
that makes the engines roar.
And it's the girl that makes the thing that holds the oil
that oils the ring that works the thing-ummy-bob
that's going to win the war."
"The Thing-Ummy Bob" is a 1942 song which was written by Gordon Thompson and David Heneker which celebrates the production line worker of World War II making components for complex weapons to win the war. Its chorus is
I'm the girl that makes the thing that drills the hole that holds the ring that drives the rod that turns the knob that works the thing-ummy bob