How close you can come to shitting yourself, without actually shitting yourself. Usually caused by explosive diarrhea.
I almost crossed the brown line this morning, I Just managed to get my pants down and take a seat before I decorated the Oval Office
by Choppasm April 12, 2023
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The opposite of silver lining. When good (or bad) news includes worse, additional information.
Boss: Well, Jimmy, you got the internship!

Jimmy: Dope.

Boss: ...the brown lining is its unpaid.

Jimmy: Rats.
by BobbyStompy February 9, 2011
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The railway that runs alongside the Hershey Highway.
Ooop, I feel a Brown Line Express coming through...
by Lady Csyde June 16, 2007
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When you think you have sweet fart, but it turns out to be a shart
Hey man I thought had a sweet fart, but when I let it rip it turned out to be a little shit. That's the thin brown line for ya
by Ddawg1990 January 20, 2018
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The biggest line known to man that only rob could consume.
A rob brown line. Bigger than the que for mcdonalds after lockdown
by Robb2020 June 7, 2020
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1. A fast-moving, no-stops train on the Brown Line.
2. A gigantic turd that tears your sphincter to shreds on the way out. Often comes without warning. So called because of a faint resemblance to a speeding subway car.
Aw man. I had a Brown Line Express this morning. I looked in the toilet, and it was actually the size of my wrist.
by Lady Csyde June 16, 2007
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Willing to get off at ANY exit in order to stave off impending fecal incontinence.
"Pull into that Moo&Oink! I got the CTA Brown Line goin' on!!! I can't wait!"
by Cock Johnson November 12, 2007
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