n. - A day to yourself where you stay in your metaphorical "shell" and do only what you want to do.

Typically, a person will stay in bed with a laptop and/or pen and paper. Maybe under blankets (like the turtle's shell)
Today, I didn't want to go to class or work, so I took a Turtle Day as my roommate brought me food in bed and I doodled all day. It was well deserved and rephreshing

I heard you're stressed out, why not take a Turtle Day? It can help you wind out!
by Saile February 9, 2011
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A day in school where one's backpack is so ponderous it looks like a turtle shell. Such magnitude in a backpack has often resulted in falling over and having one of your slightly less turtle-y friends help you back up.
Yesterday was a turtle day because we have a test tomorrow
by Elven Angel September 27, 2013
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A day when after every word you say you have to say turtle.
How's your day going "turtle". Oh it's going great "turtle". Why are we saying turtle. Because it's Turtle day
by Turtle kween hehe April 13, 2019
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