This word occurs rather frequently throughout rap songs by various artists. People often get confused about the difference between, for example, lyrics in songs saying "
rollin' on 20's" (which means their vehicle has 20" rims AKA
Dubs/
DUBs/dubz) and also saying "rollin' on
84's" - 84's doesnt mean 84 inches (obviously), nor does it mean 21 inches shares throughout the 4 wheels of the vehicle. It in fact means the number of
spokes the car has on all of its wheels. These number of spokes are commonly found on luxury Caddillacs which have been
tuned up (mainly
lowriders).
Furthermore, the term dubz is commonly referred to as 20 ounces of cocaine and sometimes even other measurements and substances. This was made popular by rap artists in America (mainly in LA, Compton) e.g.
Eazy-E.
In short, "dubz" can mean; rims of a car ranging from 20" to 24" (most likely 20") or 20's (ounces/grams) of drugs (cocaine/cannabis etc.).