Pookie day is the celebration day of your friends/lover that you often call "pookie". This day is celebrated on June 19th.
"Yo, It's June 19th! Happy pookie day babe."
This day is when you take your Pookie out for special events such as a gym date, dinner, or a movie, shit why not all 3
Friend1: did you know today is national Pookie day
Friend 2:really where are you taking me