"Hammerhead" is a not-altogether-common nickname for any BMW motorcycles with the manufacturer's classic horizontally opposed two cylinder engine. More common nicknames are "Airheads" (for the older, air cooled models) and "Oilheads" (for the newer, oil cooled models like ours); names which also apply to the riders themselves.
Front view of an R1200GS engine
"Oilheadin' North"doesn't really have a good ring to it, and right now seams more likely to conjure up images of BP and the Gulf of Mexico than a journey powered by a well balanced wonder of German engineering.