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1.
a shit that causes a terrific amount of pain and suffering, however to have one is the sign of a true man.

This comes from the war of independence when food was so scarce, dead British soldiers were eaten (by then the bodies were maggot ridden) and the rotting meat would cause discomfort when toilet time approached.
eg:

"I JUST TOOK A HUGE BRITSHIT"
"omfgz"
by stubbornbugger April 16, 2007

Words related to britshit

brit poo shit british brit-shit crap drunk sober turd
 
2.
A type of shit after passing out with your face on the toilet and no pants on.
Last nite at the party stu had a brit-shit after he had passed out.
by chanM February 18, 2010