You know, I visit this site every once in awhile, and from time to time I've seen this thread. I don't know why, but I've never read it until today.
This is just a lot more information about crapping and crap in general than I thought I might ever need.
Since I don't feel like discussing my own doody habits online just now, I think I'll contribute to this thread by announcing that I too am under the impression that it is indeed: "Sh!t Break" or "Breaks" in American Pie.
I heard "Sh!t Brick" the first time too, but upon watching the movie a few more times on cable, I discovered that Stiffler was indeed referring to the fact that he has to go home and take a break to do that......and that his ultimate revenge involves denying him the time to take that break.
"Brick" just didn't make sense after that.