ride dirty

1) To roll in your car with drugs, guns, or other shit you don't want the cops to find. Usually drugs.

2) To not have taken a shower in awhile or wiped one's ass properly.
> 1)
> "They see me rollin', they hatin', patrollin'
> Tryin' to catch me ridin' dirty."
> (Chamillionaire - "Ridin' Dirty")
> 2)
> Jim: "Hey, get your ass over here. There's [grippa] bitches. What's taking so long?"
> James: "Give me 20 minutes. Gotta take a shower."
> Jim: "Dude, you don't need a shower. The party's not gonna wait."
> James: "No, you don't understand...it was chili con carne night and we're out of T.P. The neighbors came over to complain because they thought someone was playing the trumpet terribly while firing a machine gun."
> Jim: "OOOOH yeah, good call. You really don't want to ride dirty like that."