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2.
One time I took a girl home from a bar and had anal sex with her.When I finished I had to take a piss but when I tried to push the pee out a long string of shit came out first.To me it resembled a brown worm.It must have been that her ass was full of shit and had packed my dick full of it.
I fucked my girls ass so hard last night I ended up with a brown worm!
by BurnMaster July 20, 2009
 
1.
A particularly strewn-out bowel movement in which the end result can resemble a long wriggling worm. It can also form what appears to be a "Mr whippy" in the bowl.
Sanjeet: "Mate check out this brownworm, definitely going on Ratemypoo"

Dave: "You're sick"
by raebylzzirGrizzlybear August 09, 2011