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48.
My friend got wicked embarrassed when she realized the dude she was flirting with was a diesel.
by J Dumas November 15, 2007
 
1.
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
 
2.
A street term for heroin.
Paco and I purchased some potent diesel today.
by flaco August 27, 2002
 
3.
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
 
4.
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
 
5.
extremely muscular, huge, big, a bodybuilder
damn, you seen Jamal lately? muthafucka's diesel, man!
by Iluvevans August 17, 2003
 
6.
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
 
7.
A brand of jeans and other clothing.
Dam! He looks so hot in his new diesel jeans.
by Caleb November 17, 2003