A motorcycle that's been kept running by any means possible, usually with mismatched parts and minimal maintenance. (See: Get your Sportster running Parts I and II)

a bike that is usually unkempt and is loaded with all sorts of luggage, tools, tents, bedrolls, flags, pots and pans, clothes, jackets, etc

a motorcycle which is ridden instead of cleaned, maintained at the lowest possible cost with whichever parts are at hand, and which is usually painted matt black