It's when somebody runs into the bathroom and has to shit really bad. They don't even get their pants all the way down and blast shit all over the place. The sheer horror and disbelief of a brown massacre is enough to make a grown man break into tears.
If your house is full of drunk people, or if you just had a big bean burrito, get ready for a brown massacre from hell.
by rockstarchris June 1, 2007
"I had a bucket full of Brown's Chicken and pasta last night and this morning did a Browns Chicken Massacre on my toilet."
by Are2Dee2 December 3, 2010