From the SF Bicycle Coalition:

Yes, true, the Wiggle is named due to the zigzag of bike route #30 through the neighborhood and avoiding hills. But is there more to it than that? Thinkwalks presents an exploration walk that will explore the ‘hood from this, that and askew angles: geology, activism history, water, and native tribes. Highlights include: Market Street punched through rock, 1928 highway design, insanely huge floods, Yelamu village of Chutchui, first gay couple, black financial power, SF Bicycle Coalition history, and Duboce mural.