Pooping directly down someones throat, with, or without their consent.
"Did you see that scat video? The was some grodie brownline action."
by Zibrigsx February 09, 2006
The railway that runs alongside the Hershey Highway.
Ooop, I feel a Brown Line Express coming through...
by Brian X June 16, 2007
The stain left after a wedgie occurs in undershorts. A brown line results if wiping is not sufficient after a bowel movement or a sudden burst of gas is released unexpectedly.
I hope your mom uses Tide to scrub your brown lines out of your underwear.
by DiegoSantiago June 29, 2014

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