Driving or in a vehicle where illegal substances are present or used.
A: Man, that cop almost pulled our asses over! Good thing he didn't.
B: Yeah, he woulda caught us ridin' dirty.
Cheating on your significant other.
Example: "She checked my phone when I was asleep, she was tryin to catch me ridin dirty"
Any toddler walking around with a dirty poop diaper.
Yo, that baby has a dirty load in her pants, she's ridin dirty....
She's got a big turd in her pants, and I can smell it from the other room. I know, that baby is ridin dirty.
Call da po po- she be riden dirty
Ridin dirty is when a man cums in a woman, and she goes through her day letting it ride with her. :)
-lil ma
Girl, your ridin dirty at work allday after meeting dude last night at the bar.