When you take a dump that isn't diarrhea but also isn't a hard log; it's in between the two, almost like a mud-like liquid. It builds up into the form of a hill, and it grows so large that it surfaces above the water. Hence, creating the "Brown Hill Topper".
Dude, last night I had the biggest Brown Hill Topper!!!
by AznPersuazion69 January 20, 2011