When your underwear rides up your ass.
Hey, when are you going to pull your underwear out of your ass?

Yea, they have been riding dirty for a while.
by Trolissa January 18, 2010
Sneaking in nips of alcohol (generally vodka or whiskey) to a gathering, such as the workplace, sporting events, or concerts.
"Mr. Darts was riding dirty as he walked into the arena, thirsty for some Harvard football and the Jim Bean he has neatly tucked away in his back pocket."
by shizzmoney October 02, 2009
The art of a girl riding a male like she is riding a raging bull during sexual intercourse as she mouth fucks you with a dried up terd of their choosing. The feces should be at least two days old and preferably at least four inches long for the best experience.
(Girl) Ken and I were fucking the other night and I got on top of his cock and starting riding him like a I was riding a bucking bronco. While I was dancing on his pole I seen that his cat's liter box needed to be cleaned so I picked up one of the longest dry terds and started mouth fucking him with it. After we finished, Ken looked at me with a big smile with cat liter between his teeth saying "baby that was AWESOME" I think I will call that RIDING DIRTY
by PseudoJohn April 23, 2011
...someone commits illegal, Immoral or unethical act(s) and has not 'fessed up even though everybody may know about it but so far the perpetrator hasn't been busted. The implication is that he/she will eventually get caught.
"I see they finally indicted Representative Anderson for bribery and money laundering--he's been riding dirty in the legislature for years..."

"Jack's girlfriend and his wife joined the same Oprah book group and found out that he's been riding dirty both ways...he's sleeping in the office now."
by Moira Kalish December 09, 2006
Having anal sex. Riding dirty refers to having anal sex or anal intercourse, usually without a condom.
My gal loves me riding dirty.
by Bill Alan August 15, 2006
having sex without a condom
Guy #1: Hi, my name is Andruw Jones, nice to meet you.
Girl #1: Hi I am Beyonce, it is nice to meet you.

hours later.....

Guy #1: I hit it from the back side.
Guy #2: Did you have a rubber?
Guy #1: Nah, I was riding dirty.
by Jason Caplan July 29, 2006
When you take a huge dump, and either run out of toilet paper or otherwise neglect to wipe your anus as sung about by the rapper "Chamillionaire" in his song "Ridin' Dirty."
Karl Blessing can frequently be observed riding dirty, as is evident by the fact that he smells like shit.
by seymour buttz April 18, 2006

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