(Verb.) To workout in an extreme fashion (usually having to do with MMA) or to overcome an opponent while using skill and technique as opposed to brute force.
"Dood, that diesel sesh yesterday was killer."

"Rampage is gonna diesel that fool in his next fight."

"Hey bro are you down to diesel today?"
by T diesel! May 27, 2009
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People who cause a lot of trouble.

Diesel is also one of the characters from Thomas the Tank Engine.
"There's been a diesel running up and down this train, causing all sorts of fucking havoc."
"Yeah, I still feel like there's a diesel lurking about."
"Man, I'm trying to get diesels out of my life, you know?'
"'Cause diesels bluff, they go too far."
by Lemon & Tangerine February 2, 2023
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Diesel is a code word used in front of children, grandmother's, and the sensitive individuals to communicate with your partner that you want the sex and you want it right now.
Diesel.
No other words are required. Diesel is a complete sentence in just the singular word.
by ISnackAlot July 31, 2021
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verb: When the orgasm was so good your left convulsing with ectesy, much like an old diesel motor trying to turn off.
She worked me so good that I had the most life changing zeusing of my life, and it left her dieseling like an old 64' straight 6 for at least 90 seconds after!
by mountain mowgli July 9, 2020
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The Stirling term for blackcurrent cordial with half lager, half cider.
"I'll have a Diesel with a shot of Apple Sourz in it please."

"Sorry, I'll have to give them to you separately."
by Isla Anderson March 12, 2008
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A slightly nicer word for dyke.
I hate that stupid dyke, sorry, diesel.
by Brett March 8, 2003
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