Top Definition
Awesome or strong, as in physcical power. Also - great, cool, or sexy.
"He's diesel."
"She's diesel."
"Its diesel."
by Randy Roberts January 10, 2003

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Photos & Videos
Diesel is the name used to describe the special scent that attracts the opposite sex. Most generally used with a large scale of the opposing sex.
Wow, Bryan is definitely wearing Diesel today. Every girl is all over him.
by B.Wake and P. Money February 22, 2010

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Diesel is not car fuel and oil mixed together, it's not a type of "gas," it is a lower-grade petroleum distillate used in DIESEL ENGINES which has a much higher flashpoint and whose fumes are non-explosive as opposed to gasoline's. Diesel engines use "compression-ignition" (the heat of highly compressed air in the combustion chamber) to ignite a very fine mist of diesel fuel. Used in heavy-duty trucks, generators, pumps, etc. for their higher specific torque (vs. gasoline) and greater fuel efficiency. Modern diesels are very clean, efficient, smooth, and quieter.
My Ford/Chevy/Dodge truck has a diesel engine which runs on diesel fuel. Neato!
by Hammond B-3 October 30, 2003

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extremely muscular, huge, big, a bodybuilder
damn, you seen Jamal lately? muthafucka's diesel, man!
by Iluvevans August 17, 2003

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Around the northern NJ area diesel is a code word for heroin
A brief use of the word in a conversation:

Dealer: Yo what you need man?
Buyer: i'm looking for diesel bro
Dealer: i got you
by PJ April 08, 2004

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Definition #1- Heroin
Definition #2- Big, Muscular, usually someone with alot of muscles.
On my block we pump diesel, sell packs, and pitch crack

My father is so diesel, he makes a tanktop look like a bra
by Race908 August 31, 2006

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To be unstoppable at something. Bad ass.
Angie Miller is so diesel that she has 18 wheels and doesn't even know it..look out world!
by mcbain02 June 11, 2013

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