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1.
Simply, another word for shit.
"Oh, man, I gotta make Brown Johnnies in a hurry!"
Also, if you have the runs, you can say,

"I shouldn't have eaten that hot pocket. I can feel the Runny Johnnies coming."
by Planteskaeg August 13, 2009

Words related to Brown Johnnies

dejection faeces feces ordure poo shit stool