Itchy ass causing excessive scratching due to not having a clean butthole. Commonly caused by using rough, cheap toilet paper that does not remove all of the poop. Zoo ass can be easily remedied by using higher quality toilet paper and/or baby wipes.
My employer puts cheap toilet paper in the restrooms, and I end up getting zoo ass every time I take a dump at work.
by Zoo Master August 02, 2011
I smell zoo ass, you must have been cleaning the house all day.
by Rocko1 December 09, 2009