A day for motorists to pose as cyclists for one day so that they can brag to their workmates about how healthy and environmentally conscious they are.
Bill: "I biked to work on Bike to Work Day. It's great to know that I'm keeping fit and saving the planet."

Jeff: "Bike to Work Day was three months ago. Have you biked to work since?"

Bill: "No way! The road is too scary. Once a year is more than enough."
by BeeryUSA August 1, 2012
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