What does it mean to be "ridin dirty"?

it means driving with something he's not supposed to have on him..ie drugs.

The most popular song is Dirty on 85 by Youngbloodz:

I know you waiting for daddy,

it won't be long shorty be patient cause im comin to you.

Ridin dirty on 85,

slow takin it easy i dont want nothing to keep me from you.

The word dirty is very versatile. So,'ridin dirty' could mean there's drugs in the car or it could simply mean that the car is clean. Clean as in nice rims, tinted windows, system in the trunk, etc... Not clean as in "sanitary".

that's not black human beings, its people who communicate slang interior the grimy south. Few blacks communicate that way up north. different human beings continuously have their different slangs. i will't understand why alot of folk no longer our race, continuously think of its a "black" factor. besides, ridin grimy skill specific issues a offender offense. once you're donning drugs, employing without coverage, employing with "weight" or weapons like weapons, or employing drugs in a motor vehicle; you're formally ridin grimy. Get It!

damn i got the best answer just for ridin dirty. & these cops still hoping that they catch me ridin dirty.

It means you need to take a shower.

humping someone dirty

lol...how bout the dirty sanchez ;P lol