Stewie,I'm working from memory, but I believe the indecipherable line is either "Please Mr. Sirica" or "Mister Sirica please"
Thats "Sir-Rik-Kah" phonetically and refers to Judge "Hanging John" Sirica who presided over the trial of the Watergate burglars. Just David throwing in a little contemporary (at that time) humor.
Big RiB