Stands for PIMP In Action. If you are PIA numero uno, you know you are a true playa.
Look at Glen over there wit dem ho's, he's a true PIA
Pimp in action, a sarcastic saying
Guy1:Yo! look at him with all those bitches
Guy2:PIA
deepest layer of meningeal coverings of the brain, just superficial to the brain cortex/spinal cord and just deep to the arachnoid. reflects into all the sulci of the brain and is well vascularized. paper thin, aids in nourishing, cushioning, and protecting the CNS. gets inflamed during meningitis infection, with resulting CNS impairment.
The pia mater is extremely hard to pick away from the gross brain/spinal cord ... haha, now you're sharing in my pain of getting through medschool!
Abbreviation for penis-in-anus sex, that is, sexual intercourse via the anus (anal sex).
Conner told his boyfriend he'd rather do PIA than settle for head.
Yesterday Marcus had condomless PIA sex with his wife.