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3.
Simply put, sphincter.
"Honey, what are you doing? Stay away from the poopus!"
by Harper February 21, 2004
 
1.
A Term to Describe Ones Ass, Usually used in a Humorous or Sexual Connotation
1.I Took it up the Poopus Last Night & Im Really Sore.
2.That Guy Needs to Get his Head Out of his Poopus.
3.I Gave her a nice Poopus Plunging & Came Really Hard.
by Mark X Kelly May 16, 2006
 
2.
King Kong when high.
it was poopus vs the tyrannosaurus rex.
by CaptainHappyPants August 01, 2010