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A young girl, sometimes of unconsentable age, who may have sexual affiliations with the opposite sex, but only if their age is much greater than their own. Shit-nel's are known greatly for their ability to piss off siblings, parents, and other close family members. On some occasions, Shit-nel's cause plants to die when the Shit-nel comes within five to 10 feet from said plant.
"Look how pissed off everyone is! Stop being a Shit-nel!"

"All my plants are dead!! Must be that Shit-nel coming around again."
by Super Frajiibo April 10, 2009
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2
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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3
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 11, 2014
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