When you have an explosive shit that leaves residue on the inside and under seat of the toilet.
Dude 1 "Man I'm not usin' that basin, there's shitnel everywhere."
Dude 2 "Yeah, what went off in there?"
by Jacoola April 17, 2009
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Short for shit shrapnel. When your explosive diarrhea fragments into shards and gets all over the inside of the toilet bowl, which requires thorough cleaning.
“As a result of eating too much Indian food, I blew up the toilet and got shitnel all over my ass cheeks
by Parne October 11, 2017
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Noun \shit-nul\

: Shrapnel that results from an explosive release of diarrhea. Usually plastered on the inside of a toilet bowl, but can be anywhere.
"I suppose I should get the toilet brush; there's a lot of shitnel in the shitter after taco night."
by MCShitter March 12, 2014
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