Someone who gets fecal matter on their finger and smears it on something.
I gotta go wash the walls again, Helen.

My little Johnny is quite the Poocasso.
by LuckyPunk777666 July 5, 2010
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When a person paints the wall behind the toilet with explosive diarrhea while attempting to sit. Also known as a photo finish. The best masterpieces are created after 12 beers and greasy mexican food.
My god! Someone created a poocasso in the men's bathroom!
by Johnny Slipshot March 4, 2005
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To get drunk and crap all over a public establishment
uh, oh! looks like he pulled another poocasso in the mens room!
by senormobius March 3, 2005
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Sticking a finger up your butt and using your pool to finger paint on walls,your clothing , etc
Some body pulled a poocasso in the rest stop bathroom
by Pezmander February 4, 2016
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