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1.
The erstwhile father of the comic strip character Popeye the Sailor. Popeye, who orginally was parentless, first appeared as a minor character in cartoonist Elzie Crisler Segar's comic strip "Thimble Theatre" on January 17, 1929. Poopdeck Pappy, Popeye's long-lost, woman-hating father, himself did not come into existence until the Popeye the Sailor animated film short "Goonland" (1938), created by Max Fleischer.

An elderly homosexual male.

A pedophile.
Did you read in the paper that Oscar's father was arrested down at the pool hall soliciting high school students? I swear the old fuck has degenerated into a real Poopdeck Pappy.
by Tunmy AuGratin February 23, 2006
 
2.
you have your girl friend shit on your chest and she feeds it to you with her feet. she stands beside you and uses her foot to pick up the poop and put it and her foot into your mouth.
She is a freak, she shit right on my chest then used her toes to pick it up piece by piece and put it into my mouth, making me clean em off everytime. i told my buddies about it and they now call me "poop deck pappy" cause my kid was runnin around while i told the story.
by s chamberlain snead October 04, 2004