When you Crap your pants,and it mushrooms over your Sphincter.You let it set for a few days,and then you have an Anal Mushroom.Or other wise known as,Frog Cake.
"My Kid had an Anal Mushroom in his Pants it had Crusted Over.I had to clean it up as well,damn!It was God Awfu!"
by Mushroom12 August 1, 2008