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1.
when someone who you may or may not know, takes a dump in your toilet, not using any toilet paper; does not flush, and proceeds to leave the premises.
"Dude! that chick just totally pulled a dirty Irwin and left!"

"Dude she just shit in your toilet without using tp and peaced!?"
"Yeah dude she does that all the time it's a dirty irwin"
by disty 67 September 29, 2012