Having a noticeably poor mouth hygiene to the point of blackened and/or rotting teeth, associated to damaging activity like siphoning gasoline from a vehicle or hard drug abuse. See also Meth mouth.
by Master Tricon September 17, 2025

Da embarrassing (or hilarious, depending on who you talk to, and/or whether da emotions-feeler is da "actor" or da "observer") interval of "run-on" dat sometimes occurs following da "main event" --- i.e., yer butt-trumpet keeps on "purrin' like a kitten" for an extended period afterwards, rather than just "saying its piece" and then being done wif it.
In da uproarious "National Baked Bean Month" speech, da formally-dignified speaker experiences a major bout of fart dieseling towards da end, totally goofing up said oration but majorly putting his audience in stitches.
by QuacksO June 15, 2024

"Dude,I thought that I had killed my truck when it started pulling a Diesel Dragon last night. There was fire and smoke shootin' everywhere."
by MaxP23 June 6, 2018

I could hear Paul giving Harry the ole Minnesota diesel last night. Sounded like there was a power stroke in the room next door.
by Turbo Drew August 15, 2025

Winning diesel
Drawing diesel
Losing diesel
Diesel-based
"Roachy you cunt, let's get on the diesel"
"Diesel-based excellence Stimmers"
Drawing diesel
Losing diesel
Diesel-based
"Roachy you cunt, let's get on the diesel"
"Diesel-based excellence Stimmers"
by Diesel-based September 4, 2007

The best person you will ever meet, and is strong and handsome. He is a multi-billionaire. He is also great boyfriend material. He is also a great pollical leader, and will always be good.
LOOK, IT'S DIESEL, I LOVE HIM
by biggest_D August 26, 2022

a horrible person who looks like a rat. really short and ugly. thinks he is cool but he is so lame and weird and mean. don't speak to him
by yourstupidityisgettingworsesir February 17, 2020
