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1.
The remnants after having explosive diarrhea.
After a long night of drinking, Jeanie couldn't control her bowels and there was butt shrapnel all over the walls the next day!
by Cropdustingtheworld February 27, 2011
 
2.
The remnants of poo that are missed in the wiping process. These remnants are free to flake off or stick around.
Oh no! I guess I wasn't thorough in my wiping job considering that I have a nasty case of butt shrapnel
by Lewis Hemingway May 26, 2010