Slang for a diesel engine manufactured back in the day by GM Diesel (later known as Detroit Diesel, later known as MTU). They were "screamin'" because they were loud, and "Jimmy" being casual slang for "GM." (Also known as "Jimmy Diesels.")
My job in 'Nam was to make sure them Screamin' Jimmys kept screamin' on the patrol boat, otherwise we'd have been sitting ducks for the vietcong.
by Rico Detroit March 1, 2008
Get the Screamin' Jimmy mug.Term used to describe 2-stroke Detroit Diesel engines (i.e. 6-71) known for their distinctive tones and volume. Detroit Diesel was a division of General Motors, hence "Jimmy"
Trucker #1- "Dang ol' sum bitch's trucks louder than sin!"
Trucker #2- "Boy howdy! I reckon he's got a screaming jimmy in that pig"
Trucker #2- "Boy howdy! I reckon he's got a screaming jimmy in that pig"
by Chet McPherson II June 17, 2011
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