stands for "Permission to Post, Admin". Used in facebook groups to ask for permission in posting something that may be off topic for the group
PTPA, I would like to inform everyone that we have this amazing item on sale, called the (insert product spiel here)
by Malky the Kid January 30, 2016
Push them panties aside.
precious, be a good girl and PTPA.
by Alexa Joy Smithson April 15, 2010