Originally Posted by fightthepower
Forgive me for asking. What is PFO?
A 'Patent Foramen Ovale' (PFO) is a defect in the septum (wall) between the two upper (atrial) chambers of the heart. Specifically, the defect is an incomplete closure of the atrial septum that results in the creation of a flap or a valve-like opening in the atrial septal wall.
Or in this context, 'Please
Off'
Urban Dictionary: pfo