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
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.
: 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
Dude 1 "Man I'm not usin' that basin, there's shitnel everywhere."
Dude 2 "Yeah, what went off in there?"
Dude 2 "Yeah, what went off in there?"
by Jacoola April 17, 2009