Definitions by Spacklebot

Sloppy Sidecar 

a woman performing the act of fellatio on top of a moving motorcycle, due to her hanging over the side of the motorcycle to gain access. (also known as California Sidecar, Sidehead, or Sidegasm)

She was blowing him while they were riding the harley. She was hung over the side like a sloppy sidecar.

Sloppy Sidecar by Spacklebot June 27, 2011