A nickname given to a person you like or are psyically attracted to. Usually, someone you are currently "talking, talking to". Most commonly given as a nickname for one's boyfriend or girlfriend.
Alyssa: "who are you texting?"
Ashley: "oh, i'm texting my Pookie Pants. We're playing the question game. hehe."
two words given to your boyfriend or girlfriend to make them stop being angry at you.
him: shut up dummyhead.
her: but pookie pants...
him:im sorry. i love you.