plumber
n.— «I was a flight engineer for two carriers while I waited for a flying position, and wore three stripes at both airlines. The slang aviation term “plumber” refers to a flight engineer.» —“Scrambled eggs on my hat” by Meryl Getline USA Today June 19, 2006. (source: Double-Tongued Dictionary)
Further reading
What’s it like to hike the Pacific Crest Trail all the way from Mexico to Canada? You’ll end up with sore muscles and blisters, and great stories to tell. Along the way, you’ll also pick up some slang, like NoBo, SoBo, Yo-yo and...
The slang phrase someone ate and left no crumbs means the person did something really well. In a previous call, a listener who works in theater noted the use of ate to mean “did something well,” as in they really ate that haircut! This...
Plumber is also a term used to refer to chemical engineers by chemists..