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The end of the toilet paper roll
When you are in the bathroom, and the person befor you left just a little paper on the roll, you use the cardboard cylinder to go "doo-tah-doo" to get the attention of someone else that you need a replacement roll of toilet paper
the definition of crap and "Oh darn".
My friend: hey did u doo doo.
Me: oh darn.
Something that comes out of your asshole when you sit on a toilet.