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1.
a hard piece of fecal matter that adheres on the side of the toilet.
"No matter how hard you piss on that toilet scab it never disappears"

poop staincrapdo doshitfecal
by Moshae Music June 07, 2010
 
2.
The solidification of blood around the anus caused by explosive diarrhea. It is also known to produce a "red halo."
My toilet scab is about to fall off and give me a red halo in my underwear.
by Unstable1 April 08, 2010