When you hit a bump in the road while driving and go flying through the air. Meanwhile, your passenger unknowingly slips a dildo under your ass, spearing you as you land back on your seat.
I hit a giant pothole on the highway, and before I knew it, the gay hitchhiker I picked up had given me the San Francisco Speedbump.
by Blumper Decker Dactyl September 15, 2011
Get the San Francisco Speedbumpmug.