The day following a night of heavy drinking/toxic eating, where one would poop his/her pants while sleeping or while awake.
by Weedierskeet January 7, 2011

a day in which its so hot that you sweat so much it drips down your asscrack and onto your clean white socks, which in turn become brown
by ribman January 4, 2007

The first day of school we are wearing Brown Polo shirts and that day will then be declared Brown Polo Day.
by Mr. Senor Jose Sanchez August 23, 2006

A day that is entirely taken up with necessary but mind-numbing administration, usually to clear the decks so you can get on with the stuff you're supposed to be doing.
"If I don't get this tax return done today, my head won't be clear enough to finish Ulysses. Time for a Brown Envelope Day." --James Joyce, Trieste, 1921.
by jim0203 April 4, 2010
