the act of a threesome involving to male participants. The two male shove it up the ass while they're shitting and then both tag team the girl in the left nostril and her right ear at the same time.
"Dude come over and try that shitty doo"
"i got sitty doo-ed last night"
"Chelsey liked that shitty doo last night."
"THAT SHITTY DOO ENLARGED MY NOSTRIL"
"Your shitty doos make me hear better"
"Shitty doos are you specialty Mister Rogers, hows your neighborhood?"