Top Definition
Day of Shit!, commonly referred to as DOS Day is the day you annually celebrate the first time your friend woke up with shit on his floor after having a drunk one night stand. Never let them forget that day and celebrate annually by sending them text messages like, "Hope your day isn't to shitty! Happy DOS Day"
After Matt woke up with a shit on his floor, his friend never let him down be reminding him annually of DOS Day.
by Lameo33 March 13, 2012

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