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
The word filibuster has a long and colorful history, going back to the days when pirates roamed the high seas. Today it refers to hijacking a piece of legislation. Plus, the language of yoga teachers: When doing a guided meditation, you may hear...
The slang term 4-55 air conditioning is means cooling a car by driving fast with all the windows down. This is part of a complete episode.
Related
Plumber is also a term used to refer to chemical engineers by chemists..