When your girl takes a stank shit without you knowing and then rides you during sexual intercourse.
1. Ooh baby that feel good...damn what's that smell? You ridin dirty? Nasty bitch!

2. Man I was getting with Tiffany the other night and it was all good until she got on top and I smelled somethin evil. That bitch was ridin dirty!
by JSnoop January 7, 2011
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When you take a shit and there isn`t enough / any toilet paper (or acceptable substitute) so you have to resort to pulling up your pants and going about your day unwiped.
- Damn man, you stink!
- Yeah Bro, there wasn't enough toilet paper in the John. I've been ridin dirty all day.
by Demonic Shuugs September 1, 2009
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This is when a girl has dirty panties on while wearing a skirt. She could be wearing a short or long skirt, it could be revealing as well, the key is the state of the underwear that she would be wearing.
“Man, I saw up that girl’s skirt and it was awesome till I realized that she was ridin dirty.”
by DragoTPE May 12, 2011
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Ridin A Tractor or other sort of farming equipment/ horse & Buggy on a Dirt Road.
by SHAKEANBAKE August 10, 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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The act of having gay sex with some dude nicknamed "Dirty".
I KNEW it. I KNEW Odworth was ridin' dirty!
by Jon Ace September 30, 2006
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