dated A car at the very end of a freight train, typically providing living and sleeping quarters for conductors and crew. I always romanticized a life working on trains as a kid, traveling from city to city, eating and sleeping in the monkey wagon with my fellow crewmates. There was a restaurant in town that had an old monkey wagon parked next to the building where they had kids' birthday parties.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. drug addiction. (Drugs.) Some of these treatment centers won’t get you off the monkey wagon unless you have insurance.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.