Dawson: "Walking your dog?"
This quote is a reference by Kevin Williamson in regards to the Dawson's Creek's first episode Pilot. In this episode, Joey asks Dawson how often he "walks his dog". Also Dawson tells Pacey to go home "walk his dog".
When this episode originally aired, there was some confusion about the meaning of this phrase. The above quote is a clever way of explaining to original fans that "walking your dog" was used only because the networks thought that masturbate was too graphic for teen television.