Biker Slang.
In answer to a comment. I'll define the trems. Grimy old knuckle. A knuck,or knucklehead is motor designation for Harley Davidson. It was nice to see one that's just ridden.
Billet Barge, is a bike thats basically built with all CNC'ed aluminum pieces,buy this and that and bolt it on. No soul.
R.U.B.S Rich urban Bikers. Guys with too much money that buy a motorcycle(s) ( because it's the new cool thing to own and play badass on the weekend. Oh look at me in my leather,do rag, cigar and attitude. For full effect they join the HOG ownwers groups so they can have "colors" (Like the Hells Angels) and call each other Bro. Oh and I didn't shave for that bad ass look. But have to on Sunday for work. Again no soul.