It all started with an onion article:

Shirtless Biden Washes Trans-Am in the White House Driveway
But after last night's stunning debate performance, where Biden was finally able to nail down a number of Paul Ryan's outright lies, the internet decided this should be a case of life imitating the Onion. A post went up over at fark.com with the headline I think we should get the internet to buy Biden a Trans-Am. Following in the footsteps of The Oatmeal's successful campaign to start a Tesla museum, a donation page was set up, a suitable Trans-Am was located (fire engine red, presumably for the pants-on-fire emergency response monster Biden has become) and, within hours, had gathered over a thousand dollars.
Meanwhile, discussions continued. Biden, as a public official, cannot accept such a gift. So the idea has shifted to purchasing a Trans-Am and aucting it off with the proceeds going to charity The current recipient list is the Biden Breast Health Initiative, Doctors Without Borders, the Wounded Warrior Project and GLAAD. It is the internet's fervent hope that before the Trans-Am is auctioned, Biden will himself wash it in front of the White House.
Since then, the link has spread to reddit, twitter and other social media. So if you enjoyed last night's debate, if you found it refreshing, even exhilarating to finally see the Romney/Ryan campaigned called on it's continual stream of malarkey, or if you just love a good internet meme, why not toss Uncle Joe a fiver?
The donation page is here.