Go-karting aggressively, and causing others bodily harm in doing so.
The boy in number six is ridin' dirty. He ran me into the railing.
by Dezorah July 08, 2006

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Continuing one's activities after having defecated without wiping one's anus.
Gangsta: Yo, man, he was ridin' dirty all night last night.
Homedawg: Yeah, man. That must explain why he smell like crap.
by Ward8 May 26, 2006

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The act of having gay sex with some dude nicknamed "Dirty".
I KNEW it. I KNEW Odworth was ridin' dirty!
by Jon Ace September 29, 2006

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(1) Ridin' dirty refers to the act of riding on Las Vegas public transportation (namely the Deuce Bus) for an extended period of time without travelling a great distance.

(2) The act of partially soiling one's underpants and continuing to "ride dirty" as though nothing had happened.
Person 1: We've been on this bus for like 20 minutes and we've only gone a block.
Person 2: Ya, we're ridin' dirty.

OR

Person 1: "I think I might be ridin' dirty."
Person 2: "Seriously"?
Person 1: "I dunno, I might be."
by John Incubus June 27, 2006

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When one takes a large dump and forgets to wipe, therefore leaving skid marks in one's under garments.
Your mother when she takes off her panties.

"Bitch, I be ridin' dirty"
by Amanda Gilizzle June 11, 2006

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to have anal sex with someone
or to carry weapons or drugs in your car illegally.
"yo man i had a dream last night that me and sarah were ridin' dirty, if only i could get that prude bitch to try it"
by The one who knows all April 03, 2006

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In the computer industry, the term "ridin' dirty" is used to describe a computer that's behaving erratically or running slowly due to excessive software and/or spyware on the system. Frequently, these systems must be rebooted or reinstalled.
It was taking my system like 10 minutes to boot up. Turns out it was ridin' dirty because when I removed some programs from the startup folder, it came up real quick.
by Manoj June 15, 2006

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