If you're getting bored with all the US's Words of the Yearses, just take a gander at the skanky Nether regions of Dutchland where swaffelen won 57% of an online vote.
What does it mean? The press release explains that
it means 'to swing one's penis, making it bump against something, in order to stimulate either oneself or someone else.' Regarding the word's trajectory:
The word gained notoriety through a video posted on YouTube, in which a Dutch student got arrested for "swaffling" against the Taj Mahal in India.
Grant Barrett has included swaffle over at his Double-Tongued Dictionary. You can also find it at the Urban Dictionary where the entry for swaffelen adds a note on the uh … history:
And then in the early middle ages, the noble art of swaffeling was lost. Many feared that the swaffel phenomenon had been taken away forever from mankind, however, on a booze-holiday in Blanes a group of youngsters rediscovered swaffeling, and even perfected it!
Practice, man. Practice.