Humus is not just soil, it is a community of living things. Organic matter is a breeding ground for many types of microbes, including bacteria and fungi which break down plant material, and for other microorganisms that help plants roots absorb necessary nutrients.
I agree with your analysis, but I disagree that cagers refers to an entire class of persons, all motor vehicle drivers. To me, and maybe I am not using the right definition, a cager is an @sshole motor vehicle driver.
A bobber is a custom motorcycle that has had all nonessential parts, particularly the front and rear fender, removed or shortened (i.e. âbobbedâ). Some call these straight bobbers to distinguish them from custom bobbers. A custom bobber is basically a motorcycle that looks like a bobber, but has had parts added or changed instead of just removed. Other names for custom bobbers can be short choppers, short chops or bobber style motorcycles.