Top definition
Slang for a two-cycle diesel engine manufactured back in the day by GM Diesel (later known as Detroit Diesel, later known as MTU) -- "Jimmy" being casual slang for "GM."
These newfangled engines may be better for the environment, but them Jimmy Diesels were tough as hell.
by Rico Detroit March 01, 2008
Get the mug
Get a Jimmy Diesel mug for your Facebook friend Jovana.