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1.
Converse of ridin dirty. Ridin' clean; driving a motor vehicle safely and not carrying any illegal items.
police officer; "ain't no point in hasslin' these white folk they always ridin' clean"
by Big pizzle December 11, 2006
 
2.
drive a car or truck with nice rims
This is popular use in the Memphis Area
That nigga Leroy is ridin' clean with his 20 inch rims
by Eric Barimah July 02, 2006