Motorcycle accessory, not necessarily a functional one. Believed to be originated in the forums of Advrider.com.
Derivations of the word include: Farckling, Farckle-aholic and Well-Farckled.
My next farckle will be a set of Piaas for the bike.
I am in the process of farckling my GS.
I am an admitted Farckle-aholic.
I just pulled the trigger on a well-farckled V-Strom.