What the fuck are dubs?

And how do I get them?
inb4 shitstorm
inb4 newfag (I fucking know)

Dubs are large wheel-plates on a hot-ass car. A nigger can show off his large wheel-plates in front of other niggers and/or chicks, asking them to check them out ("muh dubs, check 'em").
Idiot /prog/riders, of course, have perverted and degenerated this idea into simply a double-digit postnumber.